22373821 has 4 divisors (see below), whose sum is σ = 22522144. Its totient is φ = 22225500.

The previous prime is 22373797. The next prime is 22373831. The reversal of 22373821 is 12837322.

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 22373821 - 2⁷ = 22373693 is a prime.

It is a super-2 number, since 2×22373821² = 1001175732280082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22373821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22373831) 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, 73935 + ... + 74236.

It is an arithmetic number, because the mean of its divisors is an integer number (5630536).

Almost surely, 2^22373821 is an apocalyptic number.

It is an amenable number.

22373821 is a deficient number, since it is larger than the sum of its proper divisors (148323).

22373821 is a wasteful number, since it uses less digits than its factorization.

22373821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148322.

The product of its digits is 4032, while the sum is 28.

The square root of 22373821 is about 4730.0973562919. The cubic root of 22373821 is about 281.7820902634.

The spelling of 22373821 in words is "twenty-two million, three hundred seventy-three thousand, eight hundred twenty-one".