73999900212121 has 32 divisors (see below), whose sum is σ = 80602099200000. Its totient is φ = 67531721967360.

The previous prime is 73999900212083. The next prime is 73999900212137. The reversal of 73999900212121 is 12121200999937.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 73999900212121 - 2¹⁷ = 73999900081049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73999900212521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 905167755 + ... + 905249503.

It is an arithmetic number, because the mean of its divisors is an integer number (2518815600000).

Almost surely, 2^{73999900212121} is an apocalyptic number.

It is an amenable number.

73999900212121 is a deficient number, since it is larger than the sum of its proper divisors (6602198987879).

73999900212121 is a wasteful number, since it uses less digits than its factorization.

73999900212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83809.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The spelling of 73999900212121 in words is "seventy-three trillion, nine hundred ninety-nine billion, nine hundred million, two hundred twelve thousand, one hundred twenty-one".