21223332120121 has 4 divisors (see below), whose sum is σ = 21223384572544. Its totient is φ = 21223279667700.

The previous prime is 21223332120113. The next prime is 21223332120127. The reversal of 21223332120121 is 12102123332212.

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 21223332120121 - 2³ = 21223332120113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223332120127) 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, 25614525 + ... + 26430106.

It is an arithmetic number, because the mean of its divisors is an integer number (5305846143136).

Almost surely, 2^{21223332120121} is an apocalyptic number.

It is an amenable number.

21223332120121 is a deficient number, since it is larger than the sum of its proper divisors (52452423).

21223332120121 is an equidigital number, since it uses as much as digits as its factorization.

21223332120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52452422.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21223332120121 its reverse (12102123332212), we get a palindrome (33325455452333).

The spelling of 21223332120121 in words is "twenty-one trillion, two hundred twenty-three billion, three hundred thirty-two million, one hundred twenty thousand, one hundred twenty-one".