221496840 has 48 divisors (see below), whose sum is σ = 719865900. Its totient is φ = 59065728.

The previous prime is 221496811. The next prime is 221496857. The reversal of 221496840 is 48694122.

221496840 is digitally balanced in base 3, 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 2 ways, for example, as 220879044 + 617796 = 14862^2 + 786^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 221496795 and 221496804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307275 + ... + 307994.

Almost surely, 2^221496840 is an apocalyptic number.

221496840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221496840 is an abundant number, since it is smaller than the sum of its proper divisors (498369060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221496840 is a wasteful number, since it uses less digits than its factorization.

221496840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615286 (or 615279 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 221496840 is about 14882.7699034823. The cubic root of 221496840 is about 605.0470923888.

The spelling of 221496840 in words is "two hundred twenty-one million, four hundred ninety-six thousand, eight hundred forty".