2121622221151 has 4 divisors (see below), whose sum is σ = 2233286548600. Its totient is φ = 2009957893704.

The previous prime is 2121622221149. The next prime is 2121622221179. The reversal of 2121622221151 is 1511222261212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121622221151 - 2¹ = 2121622221149 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 (2121622221101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55832163696 + ... + 55832163733.

It is an arithmetic number, because the mean of its divisors is an integer number (558321637150).

Almost surely, 2^{2121622221151} is an apocalyptic number.

2121622221151 is a deficient number, since it is larger than the sum of its proper divisors (111664327449).

2121622221151 is a wasteful number, since it uses less digits than its factorization.

2121622221151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111664327448.

The product of its digits is 1920, while the sum is 28.

Adding to 2121622221151 its reverse (1511222261212), we get a palindrome (3632844482363).

The spelling of 2121622221151 in words is "two trillion, one hundred twenty-one billion, six hundred twenty-two million, two hundred twenty-one thousand, one hundred fifty-one".