1312221000021 has 16 divisors (see below), whose sum is σ = 1891489732800. Its totient is φ = 806371936128.

The previous prime is 1312221000017. The next prime is 1312221000031. The reversal of 1312221000021 is 1200001222131.

It is not a de Polignac number, because 1312221000021 - 2² = 1312221000017 is a prime.

It is a super-2 number, since 2×1312221000021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312221000031) 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, 311098176 + ... + 311102393.

It is an arithmetic number, because the mean of its divisors is an integer number (118218108300).

Almost surely, 2^{1312221000021} is an apocalyptic number.

It is an amenable number.

1312221000021 is a deficient number, since it is larger than the sum of its proper divisors (579268732779).

1312221000021 is a wasteful number, since it uses less digits than its factorization.

1312221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622200628.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1312221000021 its reverse (1200001222131), we get a palindrome (2512222222152).

The spelling of 1312221000021 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.