22131221352121 has 4 divisors (see below), whose sum is σ = 25292824402432. Its totient is φ = 18969618301812.

The previous prime is 22131221352103. The next prime is 22131221352127. The reversal of 22131221352121 is 12125312213122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22131221352121 - 2⁹ = 22131221351609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22131221352121.

It is not an unprimeable number, because it can be changed into a prime (22131221352127) 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, 1580801525145 + ... + 1580801525158.

It is an arithmetic number, because the mean of its divisors is an integer number (6323206100608).

Almost surely, 2^{22131221352121} is an apocalyptic number.

It is an amenable number.

22131221352121 is a deficient number, since it is larger than the sum of its proper divisors (3161603050311).

22131221352121 is an equidigital number, since it uses as much as digits as its factorization.

22131221352121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161603050310.

The product of its digits is 2880, while the sum is 28.

Adding to 22131221352121 its reverse (12125312213122), we get a palindrome (34256533565243).

The spelling of 22131221352121 in words is "twenty-two trillion, one hundred thirty-one billion, two hundred twenty-one million, three hundred fifty-two thousand, one hundred twenty-one".