21460770 has 48 divisors (see below), whose sum is σ = 56646720. Its totient is φ = 5635872.

The previous prime is 21460727. The next prime is 21460787. The reversal of 21460770 is 7706412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4251 + ... + 7809.

It is an arithmetic number, because the mean of its divisors is an integer number (1180140).

Almost surely, 2^21460770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21460770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28323360).

21460770 is an abundant number, since it is smaller than the sum of its proper divisors (35185950).

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

21460770 is a wasteful number, since it uses less digits than its factorization.

21460770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639 (or 3636 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21460770 is about 4632.5770365964. The cubic root of 21460770 is about 277.8956615504.

The spelling of 21460770 in words is "twenty-one million, four hundred sixty thousand, seven hundred seventy".