21023030131 has 2 divisors, whose sum is σ = 21023030132. Its totient is φ = 21023030130.

The previous prime is 21023030129. The next prime is 21023030141. The reversal of 21023030131 is 13103032012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023030131 - 2¹ = 21023030129 is a prime.

It is a super-2 number, since 2×21023030131² (a number of 21 digits) contains 22 as substring.

Together with 21023030129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21023030141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511515065 + 10511515066.

It is an arithmetic number, because the mean of its divisors is an integer number (10511515066).

Almost surely, 2^21023030131 is an apocalyptic number.

21023030131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023030131 is an equidigital number, since it uses as much as digits as its factorization.

21023030131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21023030131 its reverse (13103032012), we get a palindrome (34126062143).

The spelling of 21023030131 in words is "twenty-one billion, twenty-three million, thirty thousand, one hundred thirty-one".