13121100021020 has 24 divisors (see below), whose sum is σ = 28021332250800. Its totient is φ = 5159483397632.

The previous prime is 13121100021011. The next prime is 13121100021077. The reversal of 13121100021020 is 2012000112131.

It is a super-2 number, since 2×13121100021020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13121100020986 and 13121100021004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5559786965 + ... + 5559789324.

It is an arithmetic number, because the mean of its divisors is an integer number (1167555510450).

Almost surely, 2^{13121100021020} is an apocalyptic number.

13121100021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121100021020 is an abundant number, since it is smaller than the sum of its proper divisors (14900232229780).

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

13121100021020 is a wasteful number, since it uses less digits than its factorization.

13121100021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11119576357 (or 11119576355 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 13121100021020 its reverse (2012000112131), we get a palindrome (15133100133151).

The spelling of 13121100021020 in words is "thirteen trillion, one hundred twenty-one billion, one hundred million, twenty-one thousand, twenty".