21377875031 has 2 divisors, whose sum is σ = 21377875032. Its totient is φ = 21377875030.

The previous prime is 21377874983. The next prime is 21377875033. The reversal of 21377875031 is 13057877312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21377875031 - 2¹⁸ = 21377612887 is a prime.

It is a super-2 number, since 2×21377875031² (a number of 21 digits) contains 22 as substring.

Together with 21377875033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21377875033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688937515 + 10688937516.

It is an arithmetic number, because the mean of its divisors is an integer number (10688937516).

Almost surely, 2^21377875031 is an apocalyptic number.

21377875031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377875031 is an equidigital number, since it uses as much as digits as its factorization.

21377875031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 21377875031 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred seventy-five thousand, thirty-one".