21031653371 has 2 divisors, whose sum is σ = 21031653372. Its totient is φ = 21031653370.

The previous prime is 21031653347. The next prime is 21031653403. The reversal of 21031653371 is 17335613012.

It is an a-pointer prime, because the next prime (21031653403) can be obtained adding 21031653371 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031653371 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21031653341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515826685 + 10515826686.

It is an arithmetic number, because the mean of its divisors is an integer number (10515826686).

Almost surely, 2^21031653371 is an apocalyptic number.

21031653371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031653371 is an equidigital number, since it uses as much as digits as its factorization.

21031653371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 32.

The spelling of 21031653371 in words is "twenty-one billion, thirty-one million, six hundred fifty-three thousand, three hundred seventy-one".