21150015432131 has 2 divisors, whose sum is σ = 21150015432132. Its totient is φ = 21150015432130.

The previous prime is 21150015432023. The next prime is 21150015432167. The reversal of 21150015432131 is 13123451005112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21150015432131 is a prime.

It is a super-2 number, since 2×21150015432131² (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 = 21150015432094 and 21150015432103.

It is not a weakly prime, because it can be changed into another prime (21150015432631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575007716065 + 10575007716066.

It is an arithmetic number, because the mean of its divisors is an integer number (10575007716066).

Almost surely, 2^{21150015432131} is an apocalyptic number.

21150015432131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150015432131 is an equidigital number, since it uses as much as digits as its factorization.

21150015432131 is an evil number, because the sum of its binary digits is even.

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

Adding to 21150015432131 its reverse (13123451005112), we get a palindrome (34273466437243).

The spelling of 21150015432131 in words is "twenty-one trillion, one hundred fifty billion, fifteen million, four hundred thirty-two thousand, one hundred thirty-one".