1294218221 has 4 divisors (see below), whose sum is σ = 1299633600. Its totient is φ = 1288802844.

The previous prime is 1294218217. The next prime is 1294218239. The reversal of 1294218221 is 1228124921.

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 a cyclic number.

It is not a de Polignac number, because 1294218221 - 2² = 1294218217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1294218281) 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, 2707331 + ... + 2707808.

It is an arithmetic number, because the mean of its divisors is an integer number (324908400).

Almost surely, 2^1294218221 is an apocalyptic number.

It is an amenable number.

1294218221 is a deficient number, since it is larger than the sum of its proper divisors (5415379).

1294218221 is an equidigital number, since it uses as much as digits as its factorization.

1294218221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415378.

The product of its digits is 4608, while the sum is 32.

The square root of 1294218221 is about 35975.2445578901. The cubic root of 1294218221 is about 1089.7724803579.

The spelling of 1294218221 in words is "one billion, two hundred ninety-four million, two hundred eighteen thousand, two hundred twenty-one".