12121922 has 4 divisors (see below), whose sum is σ = 18182886. Its totient is φ = 6060960.

The previous prime is 12121883. The next prime is 12121927. The reversal of 12121922 is 22912121.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 11909401 + 212521 = 3451^2 + 461^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12121894 and 12121903.

It is not an unprimeable number, because it can be changed into a prime (12121927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3030479 + ... + 3030482.

Almost surely, 2^12121922 is an apocalyptic number.

12121922 is a deficient number, since it is larger than the sum of its proper divisors (6060964).

12121922 is an equidigital number, since it uses as much as digits as its factorization.

12121922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060963.

The product of its digits is 144, while the sum is 20.

The square root of 12121922 is about 3481.6550662006. The cubic root of 12121922 is about 229.7156031172.

It can be divided in two parts, 121 and 21922, that multiplied together give a palindrome (2652562).

The spelling of 12121922 in words is "twelve million, one hundred twenty-one thousand, nine hundred twenty-two".