21056350 has 24 divisors (see below), whose sum is σ = 44760528. Its totient is φ = 7219200.

The previous prime is 21056311. The next prime is 21056363. The reversal of 21056350 is 5365012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29731 + ... + 30430.

It is an arithmetic number, because the mean of its divisors is an integer number (1865022).

Almost surely, 2^21056350 is an apocalyptic number.

21056350 is an abundant number, since it is smaller than the sum of its proper divisors (23704178).

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

21056350 is a wasteful number, since it uses less digits than its factorization.

21056350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60180 (or 60175 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 21056350 is about 4588.7198650604. The cubic root of 21056350 is about 276.1389676843.

The spelling of 21056350 in words is "twenty-one million, fifty-six thousand, three hundred fifty".