21201022012109 has 8 divisors (see below), whose sum is σ = 21242303386080. Its totient is φ = 21159743479056.

The previous prime is 21201022012073. The next prime is 21201022012111. The reversal of 21201022012109 is 90121022010212.

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 21201022012109 - 2⁸ = 21201022011853 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 (21201022012189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14548487 + ... + 15939275.

It is an arithmetic number, because the mean of its divisors is an integer number (2655287923260).

Almost surely, 2^{21201022012109} is an apocalyptic number.

It is an amenable number.

21201022012109 is a deficient number, since it is larger than the sum of its proper divisors (41281373971).

21201022012109 is a wasteful number, since it uses less digits than its factorization.

21201022012109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420459.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21201022012109 in words is "twenty-one trillion, two hundred one billion, twenty-two million, twelve thousand, one hundred nine".