12278242221 has 16 divisors (see below), whose sum is σ = 18722572800. Its totient is φ = 7011312048.

The previous prime is 12278242217. The next prime is 12278242241. The reversal of 12278242221 is 12224287221.

It is not a de Polignac number, because 12278242221 - 2² = 12278242217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278242201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169731 + ... + 231008.

It is an arithmetic number, because the mean of its divisors is an integer number (1170160800).

Almost surely, 2^12278242221 is an apocalyptic number.

It is an amenable number.

12278242221 is a deficient number, since it is larger than the sum of its proper divisors (6444330579).

12278242221 is a wasteful number, since it uses less digits than its factorization.

12278242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402208.

The product of its digits is 14336, while the sum is 33.

The spelling of 12278242221 in words is "twelve billion, two hundred seventy-eight million, two hundred forty-two thousand, two hundred twenty-one".