21374760 has 64 divisors (see below), whose sum is σ = 69958080. Its totient is φ = 5181440.

The previous prime is 21374747. The next prime is 21374761. The reversal of 21374760 is 6747312.

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

It is not an unprimeable number, because it can be changed into a prime (21374761) 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, 6777 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (1093095).

Almost surely, 2^21374760 is an apocalyptic number.

21374760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21374760 is an abundant number, since it is smaller than the sum of its proper divisors (48583320).

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

21374760 is a wasteful number, since it uses less digits than its factorization.

21374760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16218 (or 16214 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21374760 is about 4623.2845467265. The cubic root of 21374760 is about 277.5239164518.

The spelling of 21374760 in words is "twenty-one million, three hundred seventy-four thousand, seven hundred sixty".