21510347133323 has 2 divisors, whose sum is σ = 21510347133324. Its totient is φ = 21510347133322.

The previous prime is 21510347133241. The next prime is 21510347133409. The reversal of 21510347133323 is 32333174301512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21510347133323 - 2²⁴ = 21510330356107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21510307133323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10755173566661 + 10755173566662.

It is an arithmetic number, because the mean of its divisors is an integer number (10755173566662).

Almost surely, 2^{21510347133323} is an apocalyptic number.

21510347133323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510347133323 is an equidigital number, since it uses as much as digits as its factorization.

21510347133323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 38.

The spelling of 21510347133323 in words is "twenty-one trillion, five hundred ten billion, three hundred forty-seven million, one hundred thirty-three thousand, three hundred twenty-three".