221253154 has 4 divisors (see below), whose sum is σ = 331879734. Its totient is φ = 110626576.

The previous prime is 221253143. The next prime is 221253173. The reversal of 221253154 is 451352122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 216531225 + 4721929 = 14715^2 + 2173^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55313287 + ... + 55313290.

Almost surely, 2^221253154 is an apocalyptic number.

221253154 is a deficient number, since it is larger than the sum of its proper divisors (110626580).

221253154 is a wasteful number, since it uses less digits than its factorization.

221253154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110626579.

The product of its digits is 2400, while the sum is 25.

The square root of 221253154 is about 14874.5808008159. The cubic root of 221253154 is about 604.8251244223.

The spelling of 221253154 in words is "two hundred twenty-one million, two hundred fifty-three thousand, one hundred fifty-four".