221234400402 has 32 divisors (see below), whose sum is σ = 462348933120. Its totient is φ = 70440366480.

The previous prime is 221234400397. The next prime is 221234400407. The reversal of 221234400402 is 204004432122.

It is an interprime number because it is at equal distance from previous prime (221234400397) and next prime (221234400407).

It is not an unprimeable number, because it can be changed into a prime (221234400407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015624 + ... + 1214067.

It is an arithmetic number, because the mean of its divisors is an integer number (14448404160).

Almost surely, 2^221234400402 is an apocalyptic number.

221234400402 is an abundant number, since it is smaller than the sum of its proper divisors (241114532718).

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

221234400402 is a wasteful number, since it uses less digits than its factorization.

221234400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230438.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 221234400402 its reverse (204004432122), we get a palindrome (425238832524).

The spelling of 221234400402 in words is "two hundred twenty-one billion, two hundred thirty-four million, four hundred thousand, four hundred two".