21770922 has 32 divisors (see below), whose sum is σ = 46048320. Its totient is φ = 6842880.

The previous prime is 21770893. The next prime is 21770927. The reversal of 21770922 is 22907712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21770922.

It is not an unprimeable number, because it can be changed into a prime (21770927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39972 + ... + 40512.

It is an arithmetic number, because the mean of its divisors is an integer number (1439010).

Almost surely, 2^21770922 is an apocalyptic number.

21770922 is an abundant number, since it is smaller than the sum of its proper divisors (24277398).

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

21770922 is a wasteful number, since it uses less digits than its factorization.

21770922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21770922 is about 4665.9320612285. The cubic root of 21770922 is about 279.2279838975.

The spelling of 21770922 in words is "twenty-one million, seven hundred seventy thousand, nine hundred twenty-two".