21407231029 has 2 divisors, whose sum is σ = 21407231030. Its totient is φ = 21407231028.

The previous prime is 21407231003. The next prime is 21407231039. The reversal of 21407231029 is 92013270412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20284310929 + 1122920100 = 142423^2 + 33510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21407231029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21407231039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703615514 + 10703615515.

It is an arithmetic number, because the mean of its divisors is an integer number (10703615515).

Almost surely, 2^21407231029 is an apocalyptic number.

It is an amenable number.

21407231029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21407231029 is an equidigital number, since it uses as much as digits as its factorization.

21407231029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 21407231029 in words is "twenty-one billion, four hundred seven million, two hundred thirty-one thousand, twenty-nine".