1321310881 has 8 divisors (see below), whose sum is σ = 1442075904. Its totient is φ = 1200653520.

The previous prime is 1321310867. The next prime is 1321310897. The reversal of 1321310881 is 1880131231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321310881 - 2¹⁷ = 1321179809 is a prime.

It is a super-2 number, since 2×1321310881² = 3491724888497992322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321310281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81 + ... + 51406.

It is an arithmetic number, because the mean of its divisors is an integer number (180259488).

Almost surely, 2^1321310881 is an apocalyptic number.

1321310881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321310881 is a deficient number, since it is larger than the sum of its proper divisors (120765023).

1321310881 is a wasteful number, since it uses less digits than its factorization.

1321310881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53831.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1321310881 is about 36349.8401784657. The cubic root of 1321310881 is about 1097.3243180585.

The spelling of 1321310881 in words is "one billion, three hundred twenty-one million, three hundred ten thousand, eight hundred eighty-one".