21111214131 has 12 divisors (see below), whose sum is σ = 34850258352. Its totient is φ = 12063550896.

The previous prime is 21111214123. The next prime is 21111214141. The reversal of 21111214131 is 13141211112.

It is not a de Polignac number, because 21111214131 - 2³ = 21111214123 is a prime.

It is a super-2 number, since 2×21111214131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111214121) 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, 167549256 + ... + 167549381.

It is an arithmetic number, because the mean of its divisors is an integer number (2904188196).

Almost surely, 2^21111214131 is an apocalyptic number.

21111214131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21111214131 is a deficient number, since it is larger than the sum of its proper divisors (13739044221).

21111214131 is a wasteful number, since it uses less digits than its factorization.

21111214131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335098650 (or 335098647 counting only the distinct ones).

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

Adding to 21111214131 its reverse (13141211112), we get a palindrome (34252425243).

The spelling of 21111214131 in words is "twenty-one billion, one hundred eleven million, two hundred fourteen thousand, one hundred thirty-one".