221121402 has 32 divisors (see below), whose sum is σ = 462436992. Its totient is φ = 70354944.

The previous prime is 221121391. The next prime is 221121403. The reversal of 221121402 is 204121122.

It is not an unprimeable number, because it can be changed into a prime (221121403) 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, 78238 + ... + 81014.

It is an arithmetic number, because the mean of its divisors is an integer number (14451156).

Almost surely, 2^221121402 is an apocalyptic number.

221121402 is an abundant number, since it is smaller than the sum of its proper divisors (241315590).

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

221121402 is a wasteful number, since it uses less digits than its factorization.

221121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221121402 is about 14870.1513778441. The cubic root of 221121402 is about 604.7050466728.

Adding to 221121402 its reverse (204121122), we get a palindrome (425242524).

The spelling of 221121402 in words is "two hundred twenty-one million, one hundred twenty-one thousand, four hundred two".