101121019999 has 4 divisors (see below), whose sum is σ = 101163492360. Its totient is φ = 101078547640.

The previous prime is 101121019957. The next prime is 101121020003. The reversal of 101121019999 is 999910121101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999910121101 = 19 ⋅52626848479.

It is a cyclic number.

It is not a de Polignac number, because 101121019999 - 2⁷ = 101121019871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101124019999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21232609 + ... + 21237370.

It is an arithmetic number, because the mean of its divisors is an integer number (25290873090).

Almost surely, 2^101121019999 is an apocalyptic number.

101121019999 is a deficient number, since it is larger than the sum of its proper divisors (42472361).

101121019999 is an equidigital number, since it uses as much as digits as its factorization.

101121019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42472360.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 101121019999 in words is "one hundred one billion, one hundred twenty-one million, nineteen thousand, nine hundred ninety-nine".