2121312421 has 8 divisors (see below), whose sum is σ = 2172820320. Its totient is φ = 2069903472.

The previous prime is 2121312397. The next prime is 2121312467. The reversal of 2121312421 is 1242131212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121312421 - 2¹⁵ = 2121279653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121312821) 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, 19611 + ... + 68023.

It is an arithmetic number, because the mean of its divisors is an integer number (271602540).

Almost surely, 2^2121312421 is an apocalyptic number.

It is an amenable number.

2121312421 is a deficient number, since it is larger than the sum of its proper divisors (51507899).

2121312421 is a wasteful number, since it uses less digits than its factorization.

2121312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49475.

The product of its digits is 192, while the sum is 19.

The square root of 2121312421 is about 46057.7075091672. The cubic root of 2121312421 is about 1284.8966938404.

Adding to 2121312421 its reverse (1242131212), we get a palindrome (3363443633).

The spelling of 2121312421 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, four hundred twenty-one".