1201021020020 has 48 divisors (see below), whose sum is σ = 2557257539088. Its totient is φ = 473723043840.

The previous prime is 1201021020011. The next prime is 1201021020029. The reversal of 1201021020020 is 200201201021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1201021020011) and next prime (1201021020029).

It can be written as a sum of positive squares in 8 ways, for example, as 35148000484 + 1165873019536 = 187478^2 + 1079756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1201021019983 and 1201021020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201021020029) 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, 6710900 + ... + 6887540.

It is an arithmetic number, because the mean of its divisors is an integer number (53276198731).

Almost surely, 2^{1201021020020} is an apocalyptic number.

1201021020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201021020020 is an abundant number, since it is smaller than the sum of its proper divisors (1356236519068).

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

1201021020020 is a wasteful number, since it uses less digits than its factorization.

1201021020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181380 (or 181378 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1201021020020 its reverse (200201201021), we get a palindrome (1401222221041).

The spelling of 1201021020020 in words is "one trillion, two hundred one billion, twenty-one million, twenty thousand, twenty".