221604623 has 2 divisors, whose sum is σ = 221604624. Its totient is φ = 221604622.

The previous prime is 221604611. The next prime is 221604653. The reversal of 221604623 is 326406122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221604623 - 2¹² = 221600527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221604592 and 221604601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221604653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110802311 + 110802312.

It is an arithmetic number, because the mean of its divisors is an integer number (110802312).

Almost surely, 2^221604623 is an apocalyptic number.

221604623 is a deficient number, since it is larger than the sum of its proper divisors (1).

221604623 is an equidigital number, since it uses as much as digits as its factorization.

221604623 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 221604623 is about 14886.3905296079. The cubic root of 221604623 is about 605.1452175143.

The spelling of 221604623 in words is "two hundred twenty-one million, six hundred four thousand, six hundred twenty-three".