1201231020 has 48 divisors (see below), whose sum is σ = 3669216768. Its totient is φ = 291207360.

The previous prime is 1201231013. The next prime is 1201231027. The reversal of 1201231020 is 201321021.

It is an interprime number because it is at equal distance from previous prime (1201231013) and next prime (1201231027).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1201230987 and 1201231005.

It is not an unprimeable number, because it can be changed into a prime (1201231027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909364 + ... + 910683.

It is an arithmetic number, because the mean of its divisors is an integer number (76442016).

Almost surely, 2^1201231020 is an apocalyptic number.

1201231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201231020 is an abundant number, since it is smaller than the sum of its proper divisors (2467985748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201231020 is a wasteful number, since it uses less digits than its factorization.

1201231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820070 (or 1820068 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1201231020 is about 34658.7798400348. The cubic root of 1201231020 is about 1063.0218210947.

Adding to 1201231020 its reverse (201321021), we get a palindrome (1402552041).

Subtracting from 1201231020 its reverse (201321021), we obtain a palindrome (999909999).

It can be divided in two parts, 1201 and 231020, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 1201231020 in words is "one billion, two hundred one million, two hundred thirty-one thousand, twenty".