21122274 has 16 divisors (see below), whose sum is σ = 42354720. Its totient is φ = 7022400.

The previous prime is 21122267. The next prime is 21122291. The reversal of 21122274 is 47222112.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122274.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1984 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (2647170).

Almost surely, 2^21122274 is an apocalyptic number.

21122274 is an abundant number, since it is smaller than the sum of its proper divisors (21232446).

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

21122274 is a wasteful number, since it uses less digits than its factorization.

21122274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9185.

The product of its digits is 448, while the sum is 21.

The square root of 21122274 is about 4595.8975184397. The cubic root of 21122274 is about 276.4268494899.

Adding to 21122274 its reverse (47222112), we get a palindrome (68344386).

The spelling of 21122274 in words is "twenty-one million, one hundred twenty-two thousand, two hundred seventy-four".