221140628 has 6 divisors (see below), whose sum is σ = 386996106. Its totient is φ = 110570312.

The previous prime is 221140609. The next prime is 221140637. The reversal of 221140628 is 826041122.

It is a happy number.

221140628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 219573124 + 1567504 = 14818^2 + 1252^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221140597 and 221140606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27642575 + ... + 27642582.

It is an arithmetic number, because the mean of its divisors is an integer number (64499351).

Almost surely, 2^221140628 is an apocalyptic number.

It is an amenable number.

221140628 is a deficient number, since it is larger than the sum of its proper divisors (165855478).

221140628 is a wasteful number, since it uses less digits than its factorization.

221140628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55285161 (or 55285159 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 221140628 is about 14870.7978266131. The cubic root of 221140628 is about 604.7225720717.

The spelling of 221140628 in words is "two hundred twenty-one million, one hundred forty thousand, six hundred twenty-eight".