21021050131 has 2 divisors, whose sum is σ = 21021050132. Its totient is φ = 21021050130.

The previous prime is 21021050117. The next prime is 21021050161. The reversal of 21021050131 is 13105012012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021050131 - 2⁷ = 21021050003 is a prime.

It is a super-2 number, since 2×21021050131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21021050161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510525065 + 10510525066.

It is an arithmetic number, because the mean of its divisors is an integer number (10510525066).

Almost surely, 2^21021050131 is an apocalyptic number.

21021050131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021050131 is an equidigital number, since it uses as much as digits as its factorization.

21021050131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21021050131 its reverse (13105012012), we get a palindrome (34126062143).

The spelling of 21021050131 in words is "twenty-one billion, twenty-one million, fifty thousand, one hundred thirty-one".