73984805212921 has 2 divisors, whose sum is σ = 73984805212922. Its totient is φ = 73984805212920.

The previous prime is 73984805212919. The next prime is 73984805212933. The reversal of 73984805212921 is 12921250848937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73761662348521 + 223142864400 = 8588461^2 + 472380^2 .

It is a cyclic number.

It is not a de Polignac number, because 73984805212921 - 2¹ = 73984805212919 is a prime.

It is a super-2 number, since 2×73984805212921² (a number of 29 digits) contains 22 as substring.

Together with 73984805212919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 73984805212921.

It is not a weakly prime, because it can be changed into another prime (73984805212951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36992402606460 + 36992402606461.

It is an arithmetic number, because the mean of its divisors is an integer number (36992402606461).

Almost surely, 2^{73984805212921} is an apocalyptic number.

It is an amenable number.

73984805212921 is a deficient number, since it is larger than the sum of its proper divisors (1).

73984805212921 is an equidigital number, since it uses as much as digits as its factorization.

73984805212921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 73984805212921 in words is "seventy-three trillion, nine hundred eighty-four billion, eight hundred five million, two hundred twelve thousand, nine hundred twenty-one".