1201312231020 has 144 divisors (see below), whose sum is σ = 3989604292128. Its totient is φ = 290175713280.

The previous prime is 1201312230953. The next prime is 1201312231027. The reversal of 1201312231020 is 201322131021.

1201312231020 is a `hidden beast` number, since 1 + 20 + 1 + 312 + 2 + 310 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1201312230984 and 1201312231002.

It is not an unprimeable number, because it can be changed into a prime (1201312231027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 546709 + ... + 1643628.

It is an arithmetic number, because the mean of its divisors is an integer number (27705585362).

Almost surely, 2^{1201312231020} is an apocalyptic number.

1201312231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201312231020 is an abundant number, since it is smaller than the sum of its proper divisors (2788292061108).

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

1201312231020 is a wasteful number, since it uses less digits than its factorization.

1201312231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190640 (or 2190635 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1201312231020 its reverse (201322131021), we get a palindrome (1402634362041).

Subtracting from 1201312231020 its reverse (201322131021), we obtain a palindrome (999990099999).

The spelling of 1201312231020 in words is "one trillion, two hundred one billion, three hundred twelve million, two hundred thirty-one thousand, twenty".