9911222121 has 4 divisors (see below), whose sum is σ = 13214962832. Its totient is φ = 6607481412.

The previous prime is 9911222089. The next prime is 9911222137. The reversal of 9911222121 is 1212221199.

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 not a de Polignac number, because 9911222121 - 2⁵ = 9911222089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9911222161) 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, 1651870351 + ... + 1651870356.

It is an arithmetic number, because the mean of its divisors is an integer number (3303740708).

Almost surely, 2^9911222121 is an apocalyptic number.

It is an amenable number.

9911222121 is a deficient number, since it is larger than the sum of its proper divisors (3303740711).

9911222121 is a wasteful number, since it uses less digits than its factorization.

9911222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303740710.

The product of its digits is 1296, while the sum is 30.

The square root of 9911222121 is about 99555.1210184589. The cubic root of 9911222121 is about 2148.0401914583.

The spelling of 9911222121 in words is "nine billion, nine hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".