2122121210021 has 32 divisors (see below), whose sum is σ = 2399540837760. Its totient is φ = 1866900639744.

The previous prime is 2122121210009. The next prime is 2122121210039. The reversal of 2122121210021 is 1200121212212.

It is a cyclic number.

It is not a de Polignac number, because 2122121210021 - 2¹⁰ = 2122121208997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122121210051) 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, 1952546 + ... + 2838428.

It is an arithmetic number, because the mean of its divisors is an integer number (74985651180).

Almost surely, 2^{2122121210021} is an apocalyptic number.

It is an amenable number.

2122121210021 is a deficient number, since it is larger than the sum of its proper divisors (277419627739).

2122121210021 is a wasteful number, since it uses less digits than its factorization.

2122121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886085.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2122121210021 its reverse (1200121212212), we get a palindrome (3322242422233).

The spelling of 2122121210021 in words is "two trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".