21122398 has 16 divisors (see below), whose sum is σ = 36597744. Its totient is φ = 9036160.

The previous prime is 21122393. The next prime is 21122399. The reversal of 21122398 is 89322112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122393) 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, 27865 + ... + 28612.

It is an arithmetic number, because the mean of its divisors is an integer number (2287359).

Almost surely, 2^21122398 is an apocalyptic number.

21122398 is a deficient number, since it is larger than the sum of its proper divisors (15475346).

21122398 is a wasteful number, since it uses less digits than its factorization.

21122398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56507.

The product of its digits is 1728, while the sum is 28.

The square root of 21122398 is about 4595.9110087120. The cubic root of 21122398 is about 276.4273904175.

The spelling of 21122398 in words is "twenty-one million, one hundred twenty-two thousand, three hundred ninety-eight".