21050124131 has 2 divisors, whose sum is σ = 21050124132. Its totient is φ = 21050124130.

The previous prime is 21050124127. The next prime is 21050124163. The reversal of 21050124131 is 13142105012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21050124131 - 2² = 21050124127 is a prime.

It is a super-2 number, since 2×21050124131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21050124181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525062065 + 10525062066.

It is an arithmetic number, because the mean of its divisors is an integer number (10525062066).

Almost surely, 2^21050124131 is an apocalyptic number.

21050124131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050124131 is an equidigital number, since it uses as much as digits as its factorization.

21050124131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21050124131 its reverse (13142105012), we get a palindrome (34192229143).

The spelling of 21050124131 in words is "twenty-one billion, fifty million, one hundred twenty-four thousand, one hundred thirty-one".