121891796834690 has 16 divisors (see below), whose sum is σ = 219407742707328. Its totient is φ = 48756161310576.

The previous prime is 121891796834629. The next prime is 121891796834699. The reversal of 121891796834690 is 96438697198121.

It is a super-2 number, since 2×121891796834690² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121891796834699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68758922 + ... + 70509381.

It is an arithmetic number, because the mean of its divisors is an integer number (13712983919208).

Almost surely, 2^{121891796834690} is an apocalyptic number.

121891796834690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121891796834690 is a deficient number, since it is larger than the sum of its proper divisors (97515945872638).

121891796834690 is a wasteful number, since it uses less digits than its factorization.

121891796834690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139355833.

The product of its (nonzero) digits is 282175488, while the sum is 74.

The spelling of 121891796834690 in words is "one hundred twenty-one trillion, eight hundred ninety-one billion, seven hundred ninety-six million, eight hundred thirty-four thousand, six hundred ninety".