21162955 has 16 divisors (see below), whose sum is σ = 28122624. Its totient is φ = 15158880.

The previous prime is 21162949. The next prime is 21162959. The reversal of 21162955 is 55926112.

It is not a de Polignac number, because 21162955 - 2¹⁷ = 21031883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21162959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (1757664).

Almost surely, 2^21162955 is an apocalyptic number.

21162955 is a deficient number, since it is larger than the sum of its proper divisors (6959669).

21162955 is a wasteful number, since it uses less digits than its factorization.

21162955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5826.

The product of its digits is 5400, while the sum is 31.

The square root of 21162955 is about 4600.3211844392. The cubic root of 21162955 is about 276.6041995386.

The spelling of 21162955 in words is "twenty-one million, one hundred sixty-two thousand, nine hundred fifty-five".