21161922 has 8 divisors (see below), whose sum is σ = 42323856. Its totient is φ = 7053972.

The previous prime is 21161911. The next prime is 21161927. The reversal of 21161922 is 22916112.

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

21161922 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21161892 and 21161901.

It is not an unprimeable number, because it can be changed into a prime (21161927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763488 + ... + 1763499.

It is an arithmetic number, because the mean of its divisors is an integer number (5290482).

Almost surely, 2^21161922 is an apocalyptic number.

21161922 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.

21161922 is a wasteful number, since it uses less digits than its factorization.

21161922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526992.

The product of its digits is 432, while the sum is 24.

The square root of 21161922 is about 4600.2089082997. The cubic root of 21161922 is about 276.5996989575.

The spelling of 21161922 in words is "twenty-one million, one hundred sixty-one thousand, nine hundred twenty-two".