21965416 has 16 divisors (see below), whose sum is σ = 44929440. Its totient is φ = 9984240.

The previous prime is 21965413. The next prime is 21965417. The reversal of 21965416 is 61456912.

It is a super-3 number, since 3×21965416³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21965413) 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, 124716 + ... + 124891.

It is an arithmetic number, because the mean of its divisors is an integer number (2808090).

Almost surely, 2^21965416 is an apocalyptic number.

It is an amenable number.

21965416 is an abundant number, since it is smaller than the sum of its proper divisors (22964024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21965416 is a wasteful number, since it uses less digits than its factorization.

21965416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249624 (or 249620 counting only the distinct ones).

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

The square root of 21965416 is about 4686.7276430362. The cubic root of 21965416 is about 280.0570292001.

The spelling of 21965416 in words is "twenty-one million, nine hundred sixty-five thousand, four hundred sixteen".