221343402 has 16 divisors (see below), whose sum is σ = 505927872. Its totient is φ = 63240960.

The previous prime is 221343371. The next prime is 221343433. The reversal of 221343402 is 204343122.

It is an interprime number because it is at equal distance from previous prime (221343371) and next prime (221343433).

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 2634999 + ... + 2635082.

It is an arithmetic number, because the mean of its divisors is an integer number (31620492).

Almost surely, 2^221343402 is an apocalyptic number.

221343402 is an abundant number, since it is smaller than the sum of its proper divisors (284584470).

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

221343402 is a wasteful number, since it uses less digits than its factorization.

221343402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270093.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221343402 is about 14877.6141232390. The cubic root of 221343402 is about 604.9073482414.

Adding to 221343402 its reverse (204343122), we get a palindrome (425686524).

The spelling of 221343402 in words is "two hundred twenty-one million, three hundred forty-three thousand, four hundred two".