73121431012 has 12 divisors (see below), whose sum is σ = 146242862080. Its totient is φ = 31337756136.

The previous prime is 73121430997. The next prime is 73121431013. The reversal of 73121431012 is 21013412137.

73121431012 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (73121431013) 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, 1305739812 + ... + 1305739867.

Almost surely, 2^73121431012 is an apocalyptic number.

It is an amenable number.

73121431012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73121431012 is a wasteful number, since it uses less digits than its factorization.

73121431012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611479690 (or 2611479688 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 73121431012 its reverse (21013412137), we get a palindrome (94134843149).

The spelling of 73121431012 in words is "seventy-three billion, one hundred twenty-one million, four hundred thirty-one thousand, twelve".