102121221230020 has 72 divisors (see below), whose sum is σ = 219123495864000. Its totient is φ = 39976931617920.

The previous prime is 102121221229861. The next prime is 102121221230023. The reversal of 102121221230020 is 20032122121201.

It is a self number, because there is not a number n which added to its sum of digits gives 102121221230020.

It is not an unprimeable number, because it can be changed into a prime (102121221230023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11361771 + ... + 18257389.

It is an arithmetic number, because the mean of its divisors is an integer number (3043381887000).

Almost surely, 2^{102121221230020} is an apocalyptic number.

102121221230020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102121221230020 is an abundant number, since it is smaller than the sum of its proper divisors (117002274633980).

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

102121221230020 is a wasteful number, since it uses less digits than its factorization.

102121221230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895949 (or 6895886 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 102121221230020 its reverse (20032122121201), we get a palindrome (122153343351221).

The spelling of 102121221230020 in words is "one hundred two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred thirty thousand, twenty".