2121405342 has 64 divisors (see below), whose sum is σ = 4912717824. Its totient is φ = 598197600.

The previous prime is 2121405311. The next prime is 2121405359. The reversal of 2121405342 is 2435041212.

It is a super-2 number, since 2×2121405342² = 9000721250132273928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058113 + ... + 1060115.

It is an arithmetic number, because the mean of its divisors is an integer number (76761216).

Almost surely, 2^2121405342 is an apocalyptic number.

2121405342 is an abundant number, since it is smaller than the sum of its proper divisors (2791312482).

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

2121405342 is a wasteful number, since it uses less digits than its factorization.

2121405342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2121405342 is about 46058.7162435081. The cubic root of 2121405342 is about 1284.9154545757.

Adding to 2121405342 its reverse (2435041212), we get a palindrome (4556446554).

The spelling of 2121405342 in words is "two billion, one hundred twenty-one million, four hundred five thousand, three hundred forty-two".