21933623 has 2 divisors, whose sum is σ = 21933624. Its totient is φ = 21933622.

The previous prime is 21933607. The next prime is 21933629. The reversal of 21933623 is 32633912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21933623 - 2⁴ = 21933607 is a prime.

It is a super-2 number, since 2×21933623² = 962167635812258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21933629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966811 + 10966812.

It is an arithmetic number, because the mean of its divisors is an integer number (10966812).

Almost surely, 2^21933623 is an apocalyptic number.

21933623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21933623 is an equidigital number, since it uses as much as digits as its factorization.

21933623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 29.

The square root of 21933623 is about 4683.3346026096. The cubic root of 21933623 is about 279.9218446834.

The spelling of 21933623 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred twenty-three".