21021000203331 has 6 divisors (see below), whose sum is σ = 30363666960380. Its totient is φ = 14014000135548.

The previous prime is 21021000203327. The next prime is 21021000203381. The reversal of 21021000203331 is 13330200012012.

21021000203331 is a `hidden beast` number, since 210 + 2 + 100 + 0 + 20 + 3 + 331 = 666.

It is not a de Polignac number, because 21021000203331 - 2² = 21021000203327 is a prime.

It is a super-2 number, since 2×21021000203331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021000203321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167833344621 + ... + 1167833344638.

Almost surely, 2^{21021000203331} is an apocalyptic number.

21021000203331 is a deficient number, since it is larger than the sum of its proper divisors (9342666757049).

21021000203331 is a wasteful number, since it uses less digits than its factorization.

21021000203331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335666689265 (or 2335666689262 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21021000203331 its reverse (13330200012012), we get a palindrome (34351200215343).

The spelling of 21021000203331 in words is "twenty-one trillion, twenty-one billion, two hundred three thousand, three hundred thirty-one".