1221243294 has 16 divisors (see below), whose sum is σ = 2447722368. Its totient is φ = 406208472.

The previous prime is 1221243281. The next prime is 1221243307. The reversal of 1221243294 is 4923421221.

It is an interprime number because it is at equal distance from previous prime (1221243281) and next prime (1221243307).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215122 + ... + 220725.

It is an arithmetic number, because the mean of its divisors is an integer number (152982648).

Almost surely, 2^1221243294 is an apocalyptic number.

1221243294 is an abundant number, since it is smaller than the sum of its proper divisors (1226479074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221243294 is a wasteful number, since it uses less digits than its factorization.

1221243294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436319.

The product of its digits is 6912, while the sum is 30.

The square root of 1221243294 is about 34946.2915629112. The cubic root of 1221243294 is about 1068.8925841298.

The spelling of 1221243294 in words is "one billion, two hundred twenty-one million, two hundred forty-three thousand, two hundred ninety-four".