921221202122129 has 4 divisors (see below), whose sum is σ = 921221921458176. Its totient is φ = 921220482786084.

The previous prime is 921221202122119. The next prime is 921221202122149.

921221202122129 is nontrivially palindromic in base 10.

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 921221202122129 - 2⁴ = 921221202122113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921221202122092 and 921221202122101.

It is not an unprimeable number, because it can be changed into a prime (921221202122119) 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, 357743609 + ... + 360309494.

It is an arithmetic number, because the mean of its divisors is an integer number (230305480364544).

Almost surely, 2^{921221202122129} is an apocalyptic number.

It is an amenable number.

921221202122129 is a deficient number, since it is larger than the sum of its proper divisors (719336047).

921221202122129 is a wasteful number, since it uses less digits than its factorization.

921221202122129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719336046.

The product of its (nonzero) digits is 20736, while the sum is 38.

It can be divided in two parts, 92122120 and 2122129, that added together give a palindrome (94244249).

The spelling of 921221202122129 in words is "nine hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-two thousand, one hundred twenty-nine".