12220051 has 4 divisors (see below), whose sum is σ = 12450672. Its totient is φ = 11989432.

The previous prime is 12220037. The next prime is 12220081. The reversal of 12220051 is 15002221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15002221 = 13 ⋅1154017.

It is a cyclic number.

It is not a de Polignac number, because 12220051 - 2⁹ = 12219539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12220031) 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, 115231 + ... + 115336.

It is an arithmetic number, because the mean of its divisors is an integer number (3112668).

Almost surely, 2^12220051 is an apocalyptic number.

12220051 is a deficient number, since it is larger than the sum of its proper divisors (230621).

12220051 is an equidigital number, since it uses as much as digits as its factorization.

12220051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230620.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 12220051 is about 3495.7189532341. The cubic root of 12220051 is about 230.3338001340. Note that the first 3 decimals are identical.

Adding to 12220051 its reverse (15002221), we get a palindrome (27222272).

The spelling of 12220051 in words is "twelve million, two hundred twenty thousand, fifty-one".