21960770 has 64 divisors (see below), whose sum is σ = 47537280. Its totient is φ = 7216128.

The previous prime is 21960769. The next prime is 21960773. The reversal of 21960770 is 7706912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21960773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41729 + ... + 42251.

It is an arithmetic number, because the mean of its divisors is an integer number (742770).

Almost surely, 2^21960770 is an apocalyptic number.

21960770 is an abundant number, since it is smaller than the sum of its proper divisors (25576510).

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

21960770 is a wasteful number, since it uses less digits than its factorization.

21960770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 21960770 is about 4686.2319618218. The cubic root of 21960770 is about 280.0372824505.

The spelling of 21960770 in words is "twenty-one million, nine hundred sixty thousand, seven hundred seventy".