21262164 has 48 divisors (see below), whose sum is σ = 61856256. Its totient is φ = 5522400.

The previous prime is 21262147. The next prime is 21262183. The reversal of 21262164 is 46126212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10582 + ... + 12429.

It is an arithmetic number, because the mean of its divisors is an integer number (1288672).

Almost surely, 2^21262164 is an apocalyptic number.

It is an amenable number.

21262164 is an abundant number, since it is smaller than the sum of its proper divisors (40594092).

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

21262164 is a wasteful number, since it uses less digits than its factorization.

21262164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23036 (or 23034 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21262164 is about 4611.0914109352. The cubic root of 21262164 is about 277.0357532688.

Adding to 21262164 its reverse (46126212), we get a palindrome (67388376).

The spelling of 21262164 in words is "twenty-one million, two hundred sixty-two thousand, one hundred sixty-four".