21120001020109 has 8 divisors (see below), whose sum is σ = 21210557181408. Its totient is φ = 21029495754000.

The previous prime is 21120001020089. The next prime is 21120001020127. The reversal of 21120001020109 is 90102010002112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120001020109 - 2²⁷ = 21119866802381 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 (21120001020149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11891962 + ... + 13552075.

It is an arithmetic number, because the mean of its divisors is an integer number (2651319647676).

Almost surely, 2^{21120001020109} is an apocalyptic number.

It is an amenable number.

21120001020109 is a deficient number, since it is larger than the sum of its proper divisors (90556161299).

21120001020109 is a wasteful number, since it uses less digits than its factorization.

21120001020109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25447595.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21120001020109 in words is "twenty-one trillion, one hundred twenty billion, one million, twenty thousand, one hundred nine".