21122354 has 16 divisors (see below), whose sum is σ = 35151840. Its totient is φ = 9437760.

The previous prime is 21122351. The next prime is 21122359. The reversal of 21122354 is 45322112.

It is not an unprimeable number, because it can be changed into a prime (21122351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6839 + ... + 9434.

It is an arithmetic number, because the mean of its divisors is an integer number (2196990).

Almost surely, 2^21122354 is an apocalyptic number.

21122354 is a deficient number, since it is larger than the sum of its proper divisors (14029486).

21122354 is a wasteful number, since it uses less digits than its factorization.

21122354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16345.

The product of its digits is 480, while the sum is 20.

The square root of 21122354 is about 4595.9062218457. The cubic root of 21122354 is about 276.4271984757.

Adding to 21122354 its reverse (45322112), we get a palindrome (66444466).

The spelling of 21122354 in words is "twenty-one million, one hundred twenty-two thousand, three hundred fifty-four".