12221929 has 4 divisors (see below), whose sum is σ = 12940884. Its totient is φ = 11502976.

The previous prime is 12221917. The next prime is 12221969. The reversal of 12221929 is 92912221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92912221 = 1487 ⋅62483.

It can be written as a sum of positive squares in 2 ways, for example, as 6365529 + 5856400 = 2523^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221929 - 2⁷ = 12221801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221897 and 12221906.

It is not an unprimeable number, because it can be changed into a prime (12221969) 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, 359452 + ... + 359485.

It is an arithmetic number, because the mean of its divisors is an integer number (3235221).

Almost surely, 2^12221929 is an apocalyptic number.

It is an amenable number.

12221929 is a deficient number, since it is larger than the sum of its proper divisors (718955).

12221929 is an equidigital number, since it uses as much as digits as its factorization.

12221929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718954.

The product of its digits is 1296, while the sum is 28.

The square root of 12221929 is about 3495.9875571861. The cubic root of 12221929 is about 230.3455989041.

The spelling of 12221929 in words is "twelve million, two hundred twenty-one thousand, nine hundred twenty-nine".