21030012131 has 2 divisors, whose sum is σ = 21030012132. Its totient is φ = 21030012130.

The previous prime is 21030012121. The next prime is 21030012167. The reversal of 21030012131 is 13121003012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030012131 - 2²⁶ = 20962903267 is a prime.

It is a super-2 number, since 2×21030012131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21030012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515006065 + 10515006066.

It is an arithmetic number, because the mean of its divisors is an integer number (10515006066).

Almost surely, 2^21030012131 is an apocalyptic number.

21030012131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030012131 is an equidigital number, since it uses as much as digits as its factorization.

21030012131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21030012131 its reverse (13121003012), we get a palindrome (34151015143).

The spelling of 21030012131 in words is "twenty-one billion, thirty million, twelve thousand, one hundred thirty-one".