102121021020 has 96 divisors (see below), whose sum is σ = 303008832000. Its totient is φ = 25625804544.

The previous prime is 102121021003. The next prime is 102121021021. The reversal of 102121021020 is 20120121201.

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 = 102121020987 and 102121021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121021021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130744 + ... + 470463.

It is an arithmetic number, because the mean of its divisors is an integer number (3156342000).

Almost surely, 2^102121021020 is an apocalyptic number.

102121021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102121021020 is an abundant number, since it is smaller than the sum of its proper divisors (200887810980).

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

102121021020 is a wasteful number, since it uses less digits than its factorization.

102121021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601387 (or 601385 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102121021020 its reverse (20120121201), we get a palindrome (122241142221).

The spelling of 102121021020 in words is "one hundred two billion, one hundred twenty-one million, twenty-one thousand, twenty".