2121211211021 has 32 divisors (see below), whose sum is σ = 2441141852160. Its totient is φ = 1805560289856.

The previous prime is 2121211210991. The next prime is 2121211211027. The reversal of 2121211211021 is 1201121121212.

It is a cyclic number.

It is not a de Polignac number, because 2121211211021 - 2⁶ = 2121211210957 is a prime.

It is a super-2 number, since 2×2121211211021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121211211027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1136159330 + ... + 1136161196.

It is an arithmetic number, because the mean of its divisors is an integer number (76285682880).

Almost surely, 2^{2121211211021} is an apocalyptic number.

It is an amenable number.

2121211211021 is a deficient number, since it is larger than the sum of its proper divisors (319930641139).

2121211211021 is a wasteful number, since it uses less digits than its factorization.

2121211211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2121211211021 its reverse (1201121121212), we get a palindrome (3322332332233).

The spelling of 2121211211021 in words is "two trillion, one hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, twenty-one".