22121897 has 8 divisors (see below), whose sum is σ = 25506816. Its totient is φ = 18793152.

The previous prime is 22121887. The next prime is 22121903. The reversal of 22121897 is 79812122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22121897 - 2¹⁰ = 22120873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121807) 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, 13193 + ... + 14774.

It is an arithmetic number, because the mean of its divisors is an integer number (3188352).

Almost surely, 2^22121897 is an apocalyptic number.

It is an amenable number.

22121897 is a deficient number, since it is larger than the sum of its proper divisors (3384919).

22121897 is a wasteful number, since it uses less digits than its factorization.

22121897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28087.

The product of its digits is 4032, while the sum is 32.

The square root of 22121897 is about 4703.3920738123. The cubic root of 22121897 is about 280.7204956219.

The spelling of 22121897 in words is "twenty-two million, one hundred twenty-one thousand, eight hundred ninety-seven".