2121313402 has 16 divisors (see below), whose sum is σ = 3544901640. Its totient is φ = 945306432.

The previous prime is 2121313379. The next prime is 2121313421. The reversal of 2121313402 is 2043131212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1662111361 + 459202041 = 40769^2 + 21429^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2121313402.

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, 1405953 + ... + 1407460.

Almost surely, 2^2121313402 is an apocalyptic number.

2121313402 is a deficient number, since it is larger than the sum of its proper divisors (1423588238).

2121313402 is a wasteful number, since it uses less digits than its factorization.

2121313402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813457.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2121313402 is about 46057.7181588493. The cubic root of 2121313402 is about 1284.8968919070.

Adding to 2121313402 its reverse (2043131212), we get a palindrome (4164444614).

The spelling of 2121313402 in words is "two billion, one hundred twenty-one million, three hundred thirteen thousand, four hundred two".