221040402 has 16 divisors (see below), whose sum is σ = 482270112. Its totient is φ = 66981920.

The previous prime is 221040401. The next prime is 221040403. The reversal of 221040402 is 204040122.

221040402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221040401) and next prime (221040403).

It is not an unprimeable number, because it can be changed into a prime (221040401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1674483 + ... + 1674614.

It is an arithmetic number, because the mean of its divisors is an integer number (30141882).

Almost surely, 2^221040402 is an apocalyptic number.

221040402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221040402 is an abundant number, since it is smaller than the sum of its proper divisors (261229710).

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

221040402 is a wasteful number, since it uses less digits than its factorization.

221040402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349113.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 221040402 is about 14867.4275515302. The cubic root of 221040402 is about 604.6312002241.

Adding to 221040402 its reverse (204040122), we get a palindrome (425080524).

The spelling of 221040402 in words is "two hundred twenty-one million, forty thousand, four hundred two".