221640307430923 has 2 divisors, whose sum is σ = 221640307430924. Its totient is φ = 221640307430922.

The previous prime is 221640307430639. The next prime is 221640307430947. The reversal of 221640307430923 is 329034703046122.

221640307430923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221640307430923 is a prime.

It is a super-2 number, since 2×221640307430923² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221640307430123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110820153715461 + 110820153715462.

It is an arithmetic number, because the mean of its divisors is an integer number (110820153715462).

Almost surely, 2^{221640307430923} is an apocalyptic number.

221640307430923 is a deficient number, since it is larger than the sum of its proper divisors (1).

221640307430923 is an equidigital number, since it uses as much as digits as its factorization.

221640307430923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 46.

The spelling of 221640307430923 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred seven million, four hundred thirty thousand, nine hundred twenty-three".