221557427348 has 24 divisors (see below), whose sum is σ = 411093044712. Its totient is φ = 104120054784.

The previous prime is 221557427309. The next prime is 221557427359. The reversal of 221557427348 is 843724755122.

It can be written as a sum of positive squares in 4 ways, for example, as 127383320464 + 94174106884 = 356908^2 + 306878^2 .

It is a super-2 number, since 2×221557427348² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 221557427296 and 221557427305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172665 + ... + 2272352.

It is an arithmetic number, because the mean of its divisors is an integer number (17128876863).

Almost surely, 2^221557427348 is an apocalyptic number.

It is an amenable number.

221557427348 is a deficient number, since it is larger than the sum of its proper divisors (189535617364).

221557427348 is a wasteful number, since it uses less digits than its factorization.

221557427348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445771 (or 4445769 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 50.

The spelling of 221557427348 in words is "two hundred twenty-one billion, five hundred fifty-seven million, four hundred twenty-seven thousand, three hundred forty-eight".