222151021 has 4 divisors (see below), whose sum is σ = 233843200. Its totient is φ = 210458844.

The previous prime is 222151001. The next prime is 222151073. The reversal of 222151021 is 120151222.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-222151021 is a prime.

It is a super-2 number, since 2×222151021² = 98702152262684882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222150986 and 222151004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222151001) 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, 5846061 + ... + 5846098.

It is an arithmetic number, because the mean of its divisors is an integer number (58460800).

Almost surely, 2^222151021 is an apocalyptic number.

It is an amenable number.

222151021 is a deficient number, since it is larger than the sum of its proper divisors (11692179).

222151021 is a wasteful number, since it uses less digits than its factorization.

222151021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11692178.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 222151021 is about 14904.7314970784. The cubic root of 222151021 is about 605.6421667635.

The spelling of 222151021 in words is "two hundred twenty-two million, one hundred fifty-one thousand, twenty-one".