221402000 has 80 divisors (see below), whose sum is σ = 552774144. Its totient is φ = 85680000.

The previous prime is 221401997. The next prime is 221402023. The reversal of 221402000 is 204122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 60215 + ... + 63785.

Almost surely, 2^221402000 is an apocalyptic number.

221402000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221402000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276387072).

221402000 is an abundant number, since it is smaller than the sum of its proper divisors (331372144).

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

221402000 is a wasteful number, since it uses less digits than its factorization.

221402000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625 (or 3609 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 221402000 is about 14879.5833274995. The cubic root of 221402000 is about 604.9607241766.

Adding to 221402000 its reverse (204122), we get a palindrome (221606122).

The spelling of 221402000 in words is "two hundred twenty-one million, four hundred two thousand".