121011800919 has 16 divisors (see below), whose sum is σ = 163604409600. Its totient is φ = 79547472576.

The previous prime is 121011800891. The next prime is 121011800941. The reversal of 121011800919 is 919008110121.

It is not a de Polignac number, because 121011800919 - 2¹⁷ = 121011669847 is a prime.

It is a super-2 number, since 2×121011800919² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121011800919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011800989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 740172 + ... + 888750.

It is an arithmetic number, because the mean of its divisors is an integer number (10225275600).

Almost surely, 2^121011800919 is an apocalyptic number.

121011800919 is a deficient number, since it is larger than the sum of its proper divisors (42592608681).

121011800919 is a wasteful number, since it uses less digits than its factorization.

121011800919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152374.

The product of its (nonzero) digits is 1296, while the sum is 33.

The spelling of 121011800919 in words is "one hundred twenty-one billion, eleven million, eight hundred thousand, nine hundred nineteen".