12191921358 has 16 divisors (see below), whose sum is σ = 24384941136. Its totient is φ = 4063790720.

The previous prime is 12191921347. The next prime is 12191921363. The reversal of 12191921358 is 85312919121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200278 + ... + 253958.

It is an arithmetic number, because the mean of its divisors is an integer number (1524058821).

Almost surely, 2^12191921358 is an apocalyptic number.

12191921358 is an abundant number, since it is smaller than the sum of its proper divisors (12193019778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12191921358 is a wasteful number, since it uses less digits than its factorization.

12191921358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91539.

The product of its digits is 38880, while the sum is 42.

The spelling of 12191921358 in words is "twelve billion, one hundred ninety-one million, nine hundred twenty-one thousand, three hundred fifty-eight".