22421921 has 4 divisors (see below), whose sum is σ = 22556352. Its totient is φ = 22287492.

The previous prime is 22421911. The next prime is 22421933. The reversal of 22421921 is 12912422.

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 22421921 - 2⁶ = 22421857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22421911) 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, 66965 + ... + 67298.

It is an arithmetic number, because the mean of its divisors is an integer number (5639088).

Almost surely, 2^22421921 is an apocalyptic number.

It is an amenable number.

22421921 is a deficient number, since it is larger than the sum of its proper divisors (134431).

22421921 is a wasteful number, since it uses less digits than its factorization.

22421921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134430.

The product of its digits is 576, while the sum is 23.

The square root of 22421921 is about 4735.1790884823. The cubic root of 22421921 is about 281.9838739668.

The spelling of 22421921 in words is "twenty-two million, four hundred twenty-one thousand, nine hundred twenty-one".