1221381117 has 12 divisors (see below), whose sum is σ = 1924600704. Its totient is φ = 740230920.

The previous prime is 1221381113. The next prime is 1221381127. The reversal of 1221381117 is 7111831221.

It is not a de Polignac number, because 1221381117 - 2² = 1221381113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221381113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6168493 + ... + 6168690.

It is an arithmetic number, because the mean of its divisors is an integer number (160383392).

Almost surely, 2^1221381117 is an apocalyptic number.

It is an amenable number.

1221381117 is a deficient number, since it is larger than the sum of its proper divisors (703219587).

1221381117 is a wasteful number, since it uses less digits than its factorization.

1221381117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12337200 (or 12337197 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 1221381117 is about 34948.2634332523. The cubic root of 1221381117 is about 1068.9327924546.

The spelling of 1221381117 in words is "one billion, two hundred twenty-one million, three hundred eighty-one thousand, one hundred seventeen".