21102010203031 has 4 divisors (see below), whose sum is σ = 22212642319000. Its totient is φ = 19991378087064.

The previous prime is 21102010203013. The next prime is 21102010203041. The reversal of 21102010203031 is 13030201020112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21102010203031 - 2¹⁷ = 21102010071959 is a prime.

It is a super-2 number, since 2×21102010203031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102010202996 and 21102010203014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102010203041) 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, 555316057956 + ... + 555316057993.

It is an arithmetic number, because the mean of its divisors is an integer number (5553160579750).

Almost surely, 2^{21102010203031} is an apocalyptic number.

21102010203031 is a deficient number, since it is larger than the sum of its proper divisors (1110632115969).

21102010203031 is a wasteful number, since it uses less digits than its factorization.

21102010203031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110632115968.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21102010203031 its reverse (13030201020112), we get a palindrome (34132211223143).

The spelling of 21102010203031 in words is "twenty-one trillion, one hundred two billion, ten million, two hundred three thousand, thirty-one".