21000021203331 has 12 divisors (see below), whose sum is σ = 30978754683552. Its totient is φ = 13702141494096.

The previous prime is 21000021203323. The next prime is 21000021203377. The reversal of 21000021203331 is 13330212000012.

21000021203331 is a `hidden beast` number, since 210 + 0 + 0 + 0 + 2 + 120 + 3 + 331 = 666.

It is not a de Polignac number, because 21000021203331 - 2³ = 21000021203323 is a prime.

It is a super-2 number, since 2×21000021203331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21000021203311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24822719676 + ... + 24822720521.

It is an arithmetic number, because the mean of its divisors is an integer number (2581562890296).

Almost surely, 2^{21000021203331} is an apocalyptic number.

21000021203331 is a deficient number, since it is larger than the sum of its proper divisors (9978733480221).

21000021203331 is a wasteful number, since it uses less digits than its factorization.

21000021203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49645440250 (or 49645440247 counting only the distinct ones).

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

Adding to 21000021203331 its reverse (13330212000012), we get a palindrome (34330233203343).

The spelling of 21000021203331 in words is "twenty-one trillion, twenty-one million, two hundred three thousand, three hundred thirty-one".