21028922 has 8 divisors (see below), whose sum is σ = 31987872. Its totient is φ = 10366300.

The previous prime is 21028919. The next prime is 21028933. The reversal of 21028922 is 22982012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21028891 and 21028900.

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, 73904 + ... + 74187.

It is an arithmetic number, because the mean of its divisors is an integer number (3998484).

Almost surely, 2^21028922 is an apocalyptic number.

21028922 is a deficient number, since it is larger than the sum of its proper divisors (10958950).

21028922 is a wasteful number, since it uses less digits than its factorization.

21028922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148164.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21028922 is about 4585.7302580941. The cubic root of 21028922 is about 276.0190160531.

The spelling of 21028922 in words is "twenty-one million, twenty-eight thousand, nine hundred twenty-two".