121894512190 has 16 divisors (see below), whose sum is σ = 239356496880. Its totient is φ = 44325277120.

The previous prime is 121894512169. The next prime is 121894512197. The reversal of 121894512190 is 91215498121.

It is a super-2 number, since 2×121894512190² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121894512197) 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, 554065855 + ... + 554066074.

It is an arithmetic number, because the mean of its divisors is an integer number (14959781055).

Almost surely, 2^121894512190 is an apocalyptic number.

121894512190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121894512190 is a deficient number, since it is larger than the sum of its proper divisors (117461984690).

121894512190 is a wasteful number, since it uses less digits than its factorization.

121894512190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108131947.

The product of its (nonzero) digits is 51840, while the sum is 43.

The spelling of 121894512190 in words is "one hundred twenty-one billion, eight hundred ninety-four million, five hundred twelve thousand, one hundred ninety".