21133464 has 32 divisors (see below), whose sum is σ = 57637440. Its totient is φ = 6404000.

The previous prime is 21133451. The next prime is 21133477. The reversal of 21133464 is 46433112.

It is an interprime number because it is at equal distance from previous prime (21133451) and next prime (21133477).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 39762 + ... + 40289.

It is an arithmetic number, because the mean of its divisors is an integer number (1801170).

Almost surely, 2^21133464 is an apocalyptic number.

21133464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21133464 is an abundant number, since it is smaller than the sum of its proper divisors (36503976).

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

21133464 is a wasteful number, since it uses less digits than its factorization.

21133464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80071 (or 80067 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 21133464 is about 4597.1147473171. The cubic root of 21133464 is about 276.4756553204.

Adding to 21133464 its reverse (46433112), we get a palindrome (67566576).

The spelling of 21133464 in words is "twenty-one million, one hundred thirty-three thousand, four hundred sixty-four".