21211252315031 has 2 divisors, whose sum is σ = 21211252315032. Its totient is φ = 21211252315030.

The previous prime is 21211252314961. The next prime is 21211252315051. The reversal of 21211252315031 is 13051325211212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211252315031 - 2¹⁴ = 21211252298647 is a prime.

It is a super-2 number, since 2×21211252315031² (a number of 27 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 = 21211252314985 and 21211252315003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211252315051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605626157515 + 10605626157516.

It is an arithmetic number, because the mean of its divisors is an integer number (10605626157516).

Almost surely, 2^{21211252315031} is an apocalyptic number.

21211252315031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211252315031 is an equidigital number, since it uses as much as digits as its factorization.

21211252315031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 21211252315031 its reverse (13051325211212), we get a palindrome (34262577526243).

The spelling of 21211252315031 in words is "twenty-one trillion, two hundred eleven billion, two hundred fifty-two million, three hundred fifteen thousand, thirty-one".