21514501031 has 2 divisors, whose sum is σ = 21514501032. Its totient is φ = 21514501030.

The previous prime is 21514500979. The next prime is 21514501061. The reversal of 21514501031 is 13010541512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21514501031 - 2⁶ = 21514500967 is a prime.

It is a super-2 number, since 2×21514501031² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21514500988 and 21514501006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21514501061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757250515 + 10757250516.

It is an arithmetic number, because the mean of its divisors is an integer number (10757250516).

Almost surely, 2^21514501031 is an apocalyptic number.

21514501031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514501031 is an equidigital number, since it uses as much as digits as its factorization.

21514501031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 21514501031 in words is "twenty-one billion, five hundred fourteen million, five hundred one thousand, thirty-one".