102001210021020 has 24 divisors (see below), whose sum is σ = 285603388059024. Its totient is φ = 27200322672256.

The previous prime is 102001210020979. The next prime is 102001210021021. The reversal of 102001210021020 is 20120012100201.

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 = 102001210020987 and 102001210021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001210021021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850010083449 + ... + 850010083568.

It is an arithmetic number, because the mean of its divisors is an integer number (11900141169126).

Almost surely, 2^{102001210021020} is an apocalyptic number.

102001210021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102001210021020 is an abundant number, since it is smaller than the sum of its proper divisors (183602178038004).

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

102001210021020 is a wasteful number, since it uses less digits than its factorization.

102001210021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700020167029 (or 1700020167027 counting only the distinct ones).

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

Adding to 102001210021020 its reverse (20120012100201), we get a palindrome (122121222121221).

The spelling of 102001210021020 in words is "one hundred two trillion, one billion, two hundred ten million, twenty-one thousand, twenty".