21431615147 has 2 divisors, whose sum is σ = 21431615148. Its totient is φ = 21431615146.

The previous prime is 21431615069. The next prime is 21431615167. The reversal of 21431615147 is 74151613412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21431615147 - 2²⁴ = 21414837931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21431615167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715807573 + 10715807574.

It is an arithmetic number, because the mean of its divisors is an integer number (10715807574).

Almost surely, 2^21431615147 is an apocalyptic number.

21431615147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431615147 is an equidigital number, since it uses as much as digits as its factorization.

21431615147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The spelling of 21431615147 in words is "twenty-one billion, four hundred thirty-one million, six hundred fifteen thousand, one hundred forty-seven".