21122369 has 4 divisors (see below), whose sum is σ = 21138096. Its totient is φ = 21106644.

The previous prime is 21122363. The next prime is 21122383. The reversal of 21122369 is 96322112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21122369 - 2²⁴ = 4345153 is a prime.

It is a super-2 number, since 2×21122369² = 892308944344322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21122363) 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, 5639 + ... + 8604.

It is an arithmetic number, because the mean of its divisors is an integer number (5284524).

Almost surely, 2^21122369 is an apocalyptic number.

It is an amenable number.

21122369 is a deficient number, since it is larger than the sum of its proper divisors (15727).

21122369 is a wasteful number, since it uses less digits than its factorization.

21122369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15726.

The product of its digits is 1296, while the sum is 26.

The square root of 21122369 is about 4595.9078537325. The cubic root of 21122369 is about 276.4272639104.

The spelling of 21122369 in words is "twenty-one million, one hundred twenty-two thousand, three hundred sixty-nine".