222154621 has 4 divisors (see below), whose sum is σ = 239243452. Its totient is φ = 205065792.

The previous prime is 222154613. The next prime is 222154627. The reversal of 222154621 is 126451222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126451222 = 2 ⋅63225611.

It can be written as a sum of positive squares in 2 ways, for example, as 17264025 + 204890596 = 4155^2 + 14314^2 .

It is a cyclic number.

It is not a de Polignac number, because 222154621 - 2³ = 222154613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222154627) 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, 8544396 + ... + 8544421.

It is an arithmetic number, because the mean of its divisors is an integer number (59810863).

Almost surely, 2^222154621 is an apocalyptic number.

It is an amenable number.

222154621 is a deficient number, since it is larger than the sum of its proper divisors (17088831).

222154621 is a wasteful number, since it uses less digits than its factorization.

222154621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17088830.

The product of its digits is 1920, while the sum is 25.

The square root of 222154621 is about 14904.8522636087. The cubic root of 222154621 is about 605.6454382617.

The spelling of 222154621 in words is "two hundred twenty-two million, one hundred fifty-four thousand, six hundred twenty-one".