21464760 has 32 divisors (see below), whose sum is σ = 64394640. Its totient is φ = 5723904.

The previous prime is 21464719. The next prime is 21464777. The reversal of 21464760 is 6746412.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 89317 + ... + 89556.

Almost surely, 2^21464760 is an apocalyptic number.

21464760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21464760 is an abundant number, since it is smaller than the sum of its proper divisors (42929880).

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

21464760 is a wasteful number, since it uses less digits than its factorization.

21464760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178887 (or 178883 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 21464760 is about 4633.0076624154. The cubic root of 21464760 is about 277.9128826625.

The spelling of 21464760 in words is "twenty-one million, four hundred sixty-four thousand, seven hundred sixty".