221434402 has 8 divisors (see below), whose sum is σ = 379601856. Its totient is φ = 94900452.

The previous prime is 221434361. The next prime is 221434471. The reversal of 221434402 is 204434122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7908358 + ... + 7908385.

It is an arithmetic number, because the mean of its divisors is an integer number (47450232).

Almost surely, 2^221434402 is an apocalyptic number.

221434402 is a deficient number, since it is larger than the sum of its proper divisors (158167454).

221434402 is a wasteful number, since it uses less digits than its factorization.

221434402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15816752.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 221434402 is about 14880.6720950366. The cubic root of 221434402 is about 604.9902345713.

Adding to 221434402 its reverse (204434122), we get a palindrome (425868524).

The spelling of 221434402 in words is "two hundred twenty-one million, four hundred thirty-four thousand, four hundred two".