1321970128 has 20 divisors (see below), whose sum is σ = 2615814720. Its totient is φ = 646921184.

The previous prime is 1321970053. The next prime is 1321970141. The reversal of 1321970128 is 8210791231.

It is a junction number, because it is equal to n+sod(n) for n = 1321970093 and 1321970102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878218 + ... + 879721.

It is an arithmetic number, because the mean of its divisors is an integer number (130790736).

Almost surely, 2^1321970128 is an apocalyptic number.

It is an amenable number.

1321970128 is a deficient number, since it is larger than the sum of its proper divisors (1293844592).

1321970128 is a wasteful number, since it uses less digits than its factorization.

1321970128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757994 (or 1757988 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1321970128 is about 36358.9071342910. The cubic root of 1321970128 is about 1097.5067852072.

The spelling of 1321970128 in words is "one billion, three hundred twenty-one million, nine hundred seventy thousand, one hundred twenty-eight".