102000020100021 has 8 divisors (see below), whose sum is σ = 151111140888960. Its totient is φ = 68000013399996.

The previous prime is 102000020100019. The next prime is 102000020100073. The reversal of 102000020100021 is 120001020000201.

It is not a de Polignac number, because 102000020100021 - 2¹ = 102000020100019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 102000020099976 and 102000020100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102000020100091) 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, 1888889261085 + ... + 1888889261138.

It is an arithmetic number, because the mean of its divisors is an integer number (18888892611120).

Almost surely, 2^{102000020100021} is an apocalyptic number.

It is an amenable number.

102000020100021 is a deficient number, since it is larger than the sum of its proper divisors (49111120788939).

102000020100021 is an equidigital number, since it uses as much as digits as its factorization.

102000020100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777778522232 (or 3777778522226 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 102000020100021 its reverse (120001020000201), we get a palindrome (222001040100222).

The spelling of 102000020100021 in words is "one hundred two trillion, twenty million, one hundred thousand, twenty-one".