21942963 has 24 divisors (see below), whose sum is σ = 36358400. Its totient is φ = 12492144.

The previous prime is 21942953. The next prime is 21943001. The reversal of 21942963 is 36924912.

It is not a de Polignac number, because 21942963 - 2⁸ = 21942707 is a prime.

It is a super-4 number, since 4×21942963⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21942923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23418 + ... + 24336.

Almost surely, 2^21942963 is an apocalyptic number.

21942963 is a deficient number, since it is larger than the sum of its proper divisors (14415437).

21942963 is a wasteful number, since it uses less digits than its factorization.

21942963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 1308 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 21942963 is about 4684.3316492324. The cubic root of 21942963 is about 279.9615721073.

The spelling of 21942963 in words is "twenty-one million, nine hundred forty-two thousand, nine hundred sixty-three".