221473740 has 48 divisors (see below), whose sum is σ = 621583200. Its totient is φ = 58920960.

The previous prime is 221473727. The next prime is 221473757. The reversal of 221473740 is 47374122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 221473698 and 221473707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22830 + ... + 31050.

It is an arithmetic number, because the mean of its divisors is an integer number (12949650).

Almost surely, 2^221473740 is an apocalyptic number.

221473740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221473740 is an abundant number, since it is smaller than the sum of its proper divisors (400109460).

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

221473740 is a wasteful number, since it uses less digits than its factorization.

221473740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8682 (or 8680 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 221473740 is about 14881.9938180339. The cubic root of 221473740 is about 605.0260581177.

The spelling of 221473740 in words is "two hundred twenty-one million, four hundred seventy-three thousand, seven hundred forty".