21935961 has 8 divisors (see below), whose sum is σ = 32497760. Its totient is φ = 14623956.

The previous prime is 21935939. The next prime is 21935983. The reversal of 21935961 is 16953912.

It is an interprime number because it is at equal distance from previous prime (21935939) and next prime (21935983).

It is not a de Polignac number, because 21935961 - 2⁷ = 21935833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21935161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406195 + ... + 406248.

It is an arithmetic number, because the mean of its divisors is an integer number (4062220).

Almost surely, 2^21935961 is an apocalyptic number.

It is an amenable number.

21935961 is a deficient number, since it is larger than the sum of its proper divisors (10561799).

21935961 is an equidigital number, since it uses as much as digits as its factorization.

21935961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812452 (or 812446 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 21935961 is about 4683.5842044315. The cubic root of 21935961 is about 279.9317903579.

The spelling of 21935961 in words is "twenty-one million, nine hundred thirty-five thousand, nine hundred sixty-one".