21111202211031 has 6 divisors (see below), whose sum is σ = 30493958749280. Its totient is φ = 14074134807348.

The previous prime is 21111202211027. The next prime is 21111202211039. The reversal of 21111202211031 is 13011220211112.

It is a happy number.

21111202211031 is a `hidden beast` number, since 211 + 11 + 202 + 211 + 0 + 31 = 666.

It is not a de Polignac number, because 21111202211031 - 2² = 21111202211027 is a prime.

It is a super-2 number, since 2×21111202211031² (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 = 21111202210995 and 21111202211013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111202211039) 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, 1172844567271 + ... + 1172844567288.

Almost surely, 2^{21111202211031} is an apocalyptic number.

21111202211031 is a deficient number, since it is larger than the sum of its proper divisors (9382756538249).

21111202211031 is a wasteful number, since it uses less digits than its factorization.

21111202211031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345689134565 (or 2345689134562 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21111202211031 its reverse (13011220211112), we get a palindrome (34122422422143).

The spelling of 21111202211031 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, two hundred eleven thousand, thirty-one".