21896963 has 8 divisors (see below), whose sum is σ = 24047616. Its totient is φ = 19773000.

The previous prime is 21896951. The next prime is 21896999. The reversal of 21896963 is 36969812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21896963 - 2¹² = 21892867 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21896263) 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, 4931 + ... + 8252.

It is an arithmetic number, because the mean of its divisors is an integer number (3005952).

Almost surely, 2^21896963 is an apocalyptic number.

21896963 is a deficient number, since it is larger than the sum of its proper divisors (2150653).

21896963 is a wasteful number, since it uses less digits than its factorization.

21896963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13345.

The product of its digits is 139968, while the sum is 44.

The square root of 21896963 is about 4679.4190878783. The cubic root of 21896963 is about 279.7658033183.

The spelling of 21896963 in words is "twenty-one million, eight hundred ninety-six thousand, nine hundred sixty-three".