222154121 has 4 divisors (see below), whose sum is σ = 253890432. Its totient is φ = 190417812.

The previous prime is 222154117. The next prime is 222154139. The reversal of 222154121 is 121451222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121451222 = 2 ⋅60725611.

It is a cyclic number.

It is not a de Polignac number, because 222154121 - 2² = 222154117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222154093 and 222154102.

It is not an unprimeable number, because it can be changed into a prime (222154421) 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, 15868145 + ... + 15868158.

It is an arithmetic number, because the mean of its divisors is an integer number (63472608).

Almost surely, 2^222154121 is an apocalyptic number.

It is an amenable number.

222154121 is a deficient number, since it is larger than the sum of its proper divisors (31736311).

222154121 is an equidigital number, since it uses as much as digits as its factorization.

222154121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31736310.

The product of its digits is 320, while the sum is 20.

The square root of 222154121 is about 14904.8354905380. The cubic root of 222154121 is about 605.6449838891.

The spelling of 222154121 in words is "two hundred twenty-two million, one hundred fifty-four thousand, one hundred twenty-one".