223154721 has 6 divisors (see below), whose sum is σ = 322334610. Its totient is φ = 148769808.

The previous prime is 223154707. The next prime is 223154741. The reversal of 223154721 is 127451322.

It can be written as a sum of positive squares in only one way, i.e., 130302225 + 92852496 = 11415^2 + 9636^2 .

It is not a de Polignac number, because 223154721 - 2⁷ = 223154593 is a prime.

It is a super-3 number, since 3×223154721³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (223154741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12397476 + ... + 12397493.

It is an arithmetic number, because the mean of its divisors is an integer number (53722435).

Almost surely, 2^223154721 is an apocalyptic number.

It is an amenable number.

223154721 is a deficient number, since it is larger than the sum of its proper divisors (99179889).

223154721 is a wasteful number, since it uses less digits than its factorization.

223154721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24794975 (or 24794972 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 223154721 is about 14938.3640670590. The cubic root of 223154721 is about 606.5529133350.

The spelling of 223154721 in words is "two hundred twenty-three million, one hundred fifty-four thousand, seven hundred twenty-one".