99913213261 has 4 divisors (see below), whose sum is σ = 99913865152. Its totient is φ = 99912561372.

The previous prime is 99913213241. The next prime is 99913213271. The reversal of 99913213261 is 16231231999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 99913213261 - 2²³ = 99904824653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99913213241) 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, 43660 + ... + 449146.

It is an arithmetic number, because the mean of its divisors is an integer number (24978466288).

Almost surely, 2^99913213261 is an apocalyptic number.

It is an amenable number.

99913213261 is a deficient number, since it is larger than the sum of its proper divisors (651891).

99913213261 is a wasteful number, since it uses less digits than its factorization.

99913213261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651890.

The product of its digits is 157464, while the sum is 46.

The spelling of 99913213261 in words is "ninety-nine billion, nine hundred thirteen million, two hundred thirteen thousand, two hundred sixty-one".