99573968421 has 12 divisors (see below), whose sum is σ = 143833592448. Its totient is φ = 66380556264.

The previous prime is 99573968353. The next prime is 99573968423. The reversal of 99573968421 is 12486937599.

It is not a de Polignac number, because 99573968421 - 2¹⁵ = 99573935653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99573968423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161836 + ... + 474698.

It is an arithmetic number, because the mean of its divisors is an integer number (11986132704).

Almost surely, 2^99573968421 is an apocalyptic number.

It is an amenable number.

99573968421 is a deficient number, since it is larger than the sum of its proper divisors (44259624027).

99573968421 is a wasteful number, since it uses less digits than its factorization.

99573968421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348232 (or 348229 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 99573968421 in words is "ninety-nine billion, five hundred seventy-three million, nine hundred sixty-eight thousand, four hundred twenty-one".