12121991435 has 8 divisors (see below), whose sum is σ = 14548539600. Its totient is φ = 9696159904.

The previous prime is 12121991419. The next prime is 12121991443. The reversal of 12121991435 is 53419912121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121991435 - 2⁴ = 12121991419 is a prime.

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, 141212 + ... + 210201.

It is an arithmetic number, because the mean of its divisors is an integer number (1818567450).

Almost surely, 2^12121991435 is an apocalyptic number.

12121991435 is a deficient number, since it is larger than the sum of its proper divisors (2426548165).

12121991435 is an equidigital number, since it uses as much as digits as its factorization.

12121991435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358317.

The product of its digits is 19440, while the sum is 38.

The spelling of 12121991435 in words is "twelve billion, one hundred twenty-one million, nine hundred ninety-one thousand, four hundred thirty-five".