102000202020021 has 4 divisors (see below), whose sum is σ = 136000269360032. Its totient is φ = 68000134680012.

The previous prime is 102000202020007. The next prime is 102000202020049. The reversal of 102000202020021 is 120020202000201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 102000202020021 - 2³¹ = 101998054536373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102000202019979 and 102000202020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102000202022021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17000033670001 + ... + 17000033670006.

It is an arithmetic number, because the mean of its divisors is an integer number (34000067340008).

Almost surely, 2^{102000202020021} is an apocalyptic number.

It is an amenable number.

102000202020021 is a deficient number, since it is larger than the sum of its proper divisors (34000067340011).

102000202020021 is an equidigital number, since it uses as much as digits as its factorization.

102000202020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34000067340010.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 102000202020021 its reverse (120020202000201), we get a palindrome (222020404020222).

The spelling of 102000202020021 in words is "one hundred two trillion, two hundred two million, twenty thousand, twenty-one".