1331221292 has 12 divisors (see below), whose sum is σ = 2386457976. Its totient is φ = 649376160.

The previous prime is 1331221291. The next prime is 1331221321. The reversal of 1331221292 is 2921221331.

It is not an unprimeable number, because it can be changed into a prime (1331221291) 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, 4058438 + ... + 4058765.

It is an arithmetic number, because the mean of its divisors is an integer number (198871498).

Almost surely, 2^1331221292 is an apocalyptic number.

It is an amenable number.

1331221292 is a deficient number, since it is larger than the sum of its proper divisors (1055236684).

1331221292 is a wasteful number, since it uses less digits than its factorization.

1331221292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117248 (or 8117246 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 1331221292 is about 36485.9053882455. The cubic root of 1331221292 is about 1100.0609586053.

The spelling of 1331221292 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred ninety-two".