2121202341021 has 8 divisors (see below), whose sum is σ = 2828818667520. Its totient is φ = 1413860454272.

The previous prime is 2121202341017. The next prime is 2121202341023. The reversal of 2121202341021 is 1201432021212.

It is a happy number.

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 2121202341021 - 2² = 2121202341017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121202341023) 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, 68591901 + ... + 68622818.

It is an arithmetic number, because the mean of its divisors is an integer number (353602333440).

Almost surely, 2^{2121202341021} is an apocalyptic number.

It is an amenable number.

2121202341021 is a deficient number, since it is larger than the sum of its proper divisors (707616326499).

2121202341021 is a wasteful number, since it uses less digits than its factorization.

2121202341021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137219875.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2121202341021 its reverse (1201432021212), we get a palindrome (3322634362233).

The spelling of 2121202341021 in words is "two trillion, one hundred twenty-one billion, two hundred two million, three hundred forty-one thousand, twenty-one".