2121400342 has 16 divisors (see below), whose sum is σ = 3238523280. Its totient is φ = 1041920352.

The previous prime is 2121400289. The next prime is 2121400349. The reversal of 2121400342 is 2430041212.

It is a super-2 number, since 2×2121400342² = 9000678822075433928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121400349) 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 7 ways as a sum of consecutive naturals, for example, 165268 + ... + 177640.

It is an arithmetic number, because the mean of its divisors is an integer number (202407705).

Almost surely, 2^2121400342 is an apocalyptic number.

2121400342 is a deficient number, since it is larger than the sum of its proper divisors (1117122938).

2121400342 is a wasteful number, since it uses less digits than its factorization.

2121400342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13887.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2121400342 is about 46058.6619649334. The cubic root of 2121400342 is about 1284.9144450904.

Adding to 2121400342 its reverse (2430041212), we get a palindrome (4551441554).

The spelling of 2121400342 in words is "two billion, one hundred twenty-one million, four hundred thousand, three hundred forty-two".