222551021 has 16 divisors (see below), whose sum is σ = 278017920. Its totient is φ = 173071680.

The previous prime is 222551011. The next prime is 222551023. The reversal of 222551021 is 120155222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 222551021 - 2⁶ = 222550957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222550984 and 222551002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222551023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40295 + ... + 45483.

It is an arithmetic number, because the mean of its divisors is an integer number (17376120).

Almost surely, 2^222551021 is an apocalyptic number.

It is an amenable number.

222551021 is a deficient number, since it is larger than the sum of its proper divisors (55466899).

222551021 is a wasteful number, since it uses less digits than its factorization.

222551021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5764.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 222551021 is about 14918.1440199510. The cubic root of 222551021 is about 606.0054505785.

The spelling of 222551021 in words is "two hundred twenty-two million, five hundred fifty-one thousand, twenty-one".