73919651021 has 2 divisors, whose sum is σ = 73919651022. Its totient is φ = 73919651020.

The previous prime is 73919650999. The next prime is 73919651083. The reversal of 73919651021 is 12015691937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73848062500 + 71588521 = 271750^2 + 8461^2 .

It is a cyclic number.

It is not a de Polignac number, because 73919651021 - 2¹⁴ = 73919634637 is a prime.

It is a super-2 number, since 2×73919651021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73919651921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36959825510 + 36959825511.

It is an arithmetic number, because the mean of its divisors is an integer number (36959825511).

Almost surely, 2^73919651021 is an apocalyptic number.

It is an amenable number.

73919651021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73919651021 is an equidigital number, since it uses as much as digits as its factorization.

73919651021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The spelling of 73919651021 in words is "seventy-three billion, nine hundred nineteen million, six hundred fifty-one thousand, twenty-one".