21416956 has 24 divisors (see below), whose sum is σ = 42666624. Its totient is φ = 9311280.

The previous prime is 21416953. The next prime is 21416987. The reversal of 21416956 is 65961412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416953) 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, 9570 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (1777776).

Almost surely, 2^21416956 is an apocalyptic number.

It is an amenable number.

21416956 is a deficient number, since it is larger than the sum of its proper divisors (21249668).

21416956 is a wasteful number, since it uses less digits than its factorization.

21416956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21201 (or 21199 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 21416956 is about 4627.8457191225. The cubic root of 21416956 is about 277.7064167741.

The spelling of 21416956 in words is "twenty-one million, four hundred sixteen thousand, nine hundred fifty-six".