102110021020 has 36 divisors (see below), whose sum is σ = 249440196600. Its totient is φ = 35009149728.

The previous prime is 102110020973. The next prime is 102110021021. The reversal of 102110021020 is 20120011201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 102110020988 and 102110021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102110021021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52095970 + ... + 52097929.

It is an arithmetic number, because the mean of its divisors is an integer number (6928894350).

Almost surely, 2^102110021020 is an apocalyptic number.

102110021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102110021020 is an abundant number, since it is smaller than the sum of its proper divisors (147330175580).

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

102110021020 is a wasteful number, since it uses less digits than its factorization.

102110021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104193922 (or 104193913 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 102110021020 its reverse (20120011201), we get a palindrome (122230032221).

The spelling of 102110021020 in words is "one hundred two billion, one hundred ten million, twenty-one thousand, twenty".