21120101019999 has 6 divisors (see below), whose sum is σ = 30506812584456. Its totient is φ = 14080067346660.

The previous prime is 21120101019991. The next prime is 21120101020069. The reversal of 21120101019999 is 99991010102112.

It is not a de Polignac number, because 21120101019999 - 2³ = 21120101019991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120101019991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1173338945547 + ... + 1173338945564.

It is an arithmetic number, because the mean of its divisors is an integer number (5084468764076).

Almost surely, 2^{21120101019999} is an apocalyptic number.

21120101019999 is a deficient number, since it is larger than the sum of its proper divisors (9386711564457).

21120101019999 is a wasteful number, since it uses less digits than its factorization.

21120101019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346677891117 (or 2346677891114 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 45.

The spelling of 21120101019999 in words is "twenty-one trillion, one hundred twenty billion, one hundred one million, nineteen thousand, nine hundred ninety-nine".