21200503031 has 16 divisors (see below), whose sum is σ = 22611388800. Its totient is φ = 19820829600.

The previous prime is 21200502971. The next prime is 21200503043. The reversal of 21200503031 is 13030500212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200503031 is a prime.

It is a super-3 number, since 3×21200503031³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200503061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426980 + ... + 474038.

It is an arithmetic number, because the mean of its divisors is an integer number (1413211800).

Almost surely, 2^21200503031 is an apocalyptic number.

21200503031 is a deficient number, since it is larger than the sum of its proper divisors (1410885769).

21200503031 is a wasteful number, since it uses less digits than its factorization.

21200503031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47390.

The product of its (nonzero) digits is 180, while the sum is 17.

The spelling of 21200503031 in words is "twenty-one billion, two hundred million, five hundred three thousand, thirty-one".