1312000221 has 16 divisors (see below), whose sum is σ = 2004236928. Its totient is φ = 747840000.

The previous prime is 1312000181. The next prime is 1312000243. The reversal of 1312000221 is 1220002131.

It is not a de Polignac number, because 1312000221 - 2⁷ = 1312000093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312000197 and 1312000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312000621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69480 + ... + 86321.

It is an arithmetic number, because the mean of its divisors is an integer number (125264808).

Almost surely, 2^1312000221 is an apocalyptic number.

It is an amenable number.

1312000221 is a deficient number, since it is larger than the sum of its proper divisors (692236707).

1312000221 is a wasteful number, since it uses less digits than its factorization.

1312000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156212.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1312000221 is about 36221.5436032204. The cubic root of 1312000221 is about 1094.7407964276.

Adding to 1312000221 its reverse (1220002131), we get a palindrome (2532002352).

The spelling of 1312000221 in words is "one billion, three hundred twelve million, two hundred twenty-one", and thus it is an aban number.