221434323402 has 16 divisors (see below), whose sum is σ = 443192634432. Its totient is φ = 73757443200.

The previous prime is 221434323389. The next prime is 221434323431. The reversal of 221434323402 is 204323434122.

It is a self number, because there is not a number n which added to its sum of digits gives 221434323402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13490599 + ... + 13507002.

It is an arithmetic number, because the mean of its divisors is an integer number (27699539652).

Almost surely, 2^221434323402 is an apocalyptic number.

221434323402 is an abundant number, since it is smaller than the sum of its proper divisors (221758311030).

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

221434323402 is a wasteful number, since it uses less digits than its factorization.

221434323402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26998973.

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 221434323402 its reverse (204323434122), we get a palindrome (425757757524).

The spelling of 221434323402 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred twenty-three thousand, four hundred two".