121791872642 has 24 divisors (see below), whose sum is σ = 201515281968. Its totient is φ = 55164292920.

The previous prime is 121791872591. The next prime is 121791872701. The reversal of 121791872642 is 246278197121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 820688 + ... + 957659.

It is an arithmetic number, because the mean of its divisors is an integer number (8396470082).

Almost surely, 2^121791872642 is an apocalyptic number.

121791872642 is a deficient number, since it is larger than the sum of its proper divisors (79723409326).

121791872642 is a wasteful number, since it uses less digits than its factorization.

121791872642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778654 (or 1778643 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The spelling of 121791872642 in words is "one hundred twenty-one billion, seven hundred ninety-one million, eight hundred seventy-two thousand, six hundred forty-two".