21055722 has 8 divisors (see below), whose sum is σ = 42111456. Its totient is φ = 7018572.

The previous prime is 21055717. The next prime is 21055733. The reversal of 21055722 is 22755012.

It is a sphenic number, since it is the product of 3 distinct primes.

21055722 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21055692 and 21055701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754638 + ... + 1754649.

It is an arithmetic number, because the mean of its divisors is an integer number (5263932).

Almost surely, 2^21055722 is an apocalyptic number.

21055722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21055722 is a wasteful number, since it uses less digits than its factorization.

21055722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3509292.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21055722 is about 4588.6514358796. The cubic root of 21055722 is about 276.1362224001.

The spelling of 21055722 in words is "twenty-one million, fifty-five thousand, seven hundred twenty-two".