21960623 has 4 divisors (see below), whose sum is σ = 22013208. Its totient is φ = 21908040.

The previous prime is 21960619. The next prime is 21960641. The reversal of 21960623 is 32606912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21960623 - 2² = 21960619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25661 + ... + 26502.

It is an arithmetic number, because the mean of its divisors is an integer number (5503302).

Almost surely, 2^21960623 is an apocalyptic number.

21960623 is a deficient number, since it is larger than the sum of its proper divisors (52585).

21960623 is an equidigital number, since it uses as much as digits as its factorization.

21960623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52584.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21960623 is about 4686.2162775527. The cubic root of 21960623 is about 280.0366576155.

The spelling of 21960623 in words is "twenty-one million, nine hundred sixty thousand, six hundred twenty-three".