21507464232323 has 2 divisors, whose sum is σ = 21507464232324. Its totient is φ = 21507464232322.

The previous prime is 21507464232299. The next prime is 21507464232389. The reversal of 21507464232323 is 32323246470512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21507464232323 is a prime.

It is not a weakly prime, because it can be changed into another prime (21507464234323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753732116161 + 10753732116162.

It is an arithmetic number, because the mean of its divisors is an integer number (10753732116162).

Almost surely, 2^{21507464232323} is an apocalyptic number.

21507464232323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507464232323 is an equidigital number, since it uses as much as digits as its factorization.

21507464232323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 44.

The spelling of 21507464232323 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty-four million, two hundred thirty-two thousand, three hundred twenty-three".