216620423 has 2 divisors, whose sum is σ = 216620424. Its totient is φ = 216620422.

The previous prime is 216620399. The next prime is 216620429. The reversal of 216620423 is 324026612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216620423 - 2²² = 212426119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216620392 and 216620401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216620429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108310211 + 108310212.

It is an arithmetic number, because the mean of its divisors is an integer number (108310212).

Almost surely, 2^216620423 is an apocalyptic number.

216620423 is a deficient number, since it is larger than the sum of its proper divisors (1).

216620423 is an equidigital number, since it uses as much as digits as its factorization.

216620423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 216620423 is about 14718.0305408027. The cubic root of 216620423 is about 600.5739165986.

The spelling of 216620423 in words is "two hundred sixteen million, six hundred twenty thousand, four hundred twenty-three".