221409474 has 64 divisors (see below), whose sum is σ = 523127808. Its totient is φ = 61588800.

The previous prime is 221409469. The next prime is 221409481. The reversal of 221409474 is 474904122.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180427 + ... + 181649.

It is an arithmetic number, because the mean of its divisors is an integer number (8173872).

Almost surely, 2^221409474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221409474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261563904).

221409474 is an abundant number, since it is smaller than the sum of its proper divisors (301718334).

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

221409474 is a wasteful number, since it uses less digits than its factorization.

221409474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 221409474 is about 14879.8344748858. The cubic root of 221409474 is about 604.9675314406.

The spelling of 221409474 in words is "two hundred twenty-one million, four hundred nine thousand, four hundred seventy-four".