321070043981 has 4 divisors (see below), whose sum is σ = 321071983932. Its totient is φ = 321068104032.

The previous prime is 321070043977. The next prime is 321070044017. The reversal of 321070043981 is 189340070123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189340070123 = 263 ⋅719924221.

It can be written as a sum of positive squares in 2 ways, for example, as 83154373225 + 237915670756 = 288365^2 + 487766^2 .

It is a cyclic number.

It is not a de Polignac number, because 321070043981 - 2² = 321070043977 is a prime.

It is a super-2 number, since 2×321070043981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321070043911) 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, 695906 + ... + 1061331.

It is an arithmetic number, because the mean of its divisors is an integer number (80267995983).

Almost surely, 2^321070043981 is an apocalyptic number.

It is an amenable number.

321070043981 is a deficient number, since it is larger than the sum of its proper divisors (1939951).

321070043981 is a wasteful number, since it uses less digits than its factorization.

321070043981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939950.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 321070043981 in words is "three hundred twenty-one billion, seventy million, forty-three thousand, nine hundred eighty-one".