2321121402 has 12 divisors (see below), whose sum is σ = 5029096410. Its totient is φ = 773707128.

The previous prime is 2321121389. The next prime is 2321121409. The reversal of 2321121402 is 2041211232.

It is a happy number.

2321121402 is a `hidden beast` number, since 232 + 11 + 21 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1681082001 + 640039401 = 41001^2 + 25299^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 128951189 = 2321121402 / (2 + 3 + 2 + 1 + 1 + 2 + 1 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (2321121409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64475577 + ... + 64475612.

Almost surely, 2^2321121402 is an apocalyptic number.

2321121402 is an abundant number, since it is smaller than the sum of its proper divisors (2707975008).

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

2321121402 is a wasteful number, since it uses less digits than its factorization.

2321121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128951197 (or 128951194 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2321121402 is about 48178.0178297115. The cubic root of 2321121402 is about 1324.0344506116.

Adding to 2321121402 its reverse (2041211232), we get a palindrome (4362332634).

The spelling of 2321121402 in words is "two billion, three hundred twenty-one million, one hundred twenty-one thousand, four hundred two".