21962423 has 16 divisors (see below), whose sum is σ = 27141120. Its totient is φ = 17348256.

The previous prime is 21962411. The next prime is 21962431. The reversal of 21962423 is 32426912.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21962423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21962443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2690 + ... + 7152.

It is an arithmetic number, because the mean of its divisors is an integer number (1696320).

Almost surely, 2^21962423 is an apocalyptic number.

21962423 is a deficient number, since it is larger than the sum of its proper divisors (5178697).

21962423 is a wasteful number, since it uses less digits than its factorization.

21962423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526.

The product of its digits is 5184, while the sum is 29.

The square root of 21962423 is about 4686.4083262132. The cubic root of 21962423 is about 280.0443084642.

The spelling of 21962423 in words is "twenty-one million, nine hundred sixty-two thousand, four hundred twenty-three".