21311132031 has 12 divisors (see below), whose sum is σ = 35180281552. Its totient is φ = 12177789696.

The previous prime is 21311131981. The next prime is 21311132033. The reversal of 21311132031 is 13023111312.

21311132031 is a `hidden beast` number, since 2 + 1 + 311 + 1 + 320 + 31 = 666.

It is not a de Polignac number, because 21311132031 - 2¹³ = 21311123839 is a prime.

It is a super-2 number, since 2×21311132031² (a number of 21 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 = 21311131995 and 21311132013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311132033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169135906 + ... + 169136031.

Almost surely, 2^21311132031 is an apocalyptic number.

21311132031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21311132031 is a deficient number, since it is larger than the sum of its proper divisors (13869149521).

21311132031 is a wasteful number, since it uses less digits than its factorization.

21311132031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338271950 (or 338271947 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21311132031 its reverse (13023111312), we get a palindrome (34334243343).

The spelling of 21311132031 in words is "twenty-one billion, three hundred eleven million, one hundred thirty-two thousand, thirty-one".