21271464 has 32 divisors (see below), whose sum is σ = 59088000. Its totient is φ = 7090416.

The previous prime is 21271451. The next prime is 21271483. The reversal of 21271464 is 46417212.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 49024 + ... + 49455.

It is an arithmetic number, because the mean of its divisors is an integer number (1846500).

Almost surely, 2^21271464 is an apocalyptic number.

21271464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21271464 is an abundant number, since it is smaller than the sum of its proper divisors (37816536).

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

21271464 is a wasteful number, since it uses less digits than its factorization.

21271464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98494 (or 98484 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21271464 is about 4612.0997387307. The cubic root of 21271464 is about 277.0761388877.

Adding to 21271464 its reverse (46417212), we get a palindrome (67688676).

The spelling of 21271464 in words is "twenty-one million, two hundred seventy-one thousand, four hundred sixty-four".