21110212020021 has 8 divisors (see below), whose sum is σ = 29054915468544. Its totient is φ = 13619491625760.

The previous prime is 21110212019909. The next prime is 21110212020071. The reversal of 21110212020021 is 12002021201112.

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

It is not a de Polignac number, because 21110212020021 - 2⁹ = 21110212019509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110212020071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113495763456 + ... + 113495763641.

It is an arithmetic number, because the mean of its divisors is an integer number (3631864433568).

Almost surely, 2^{21110212020021} is an apocalyptic number.

It is an amenable number.

21110212020021 is a deficient number, since it is larger than the sum of its proper divisors (7944703448523).

21110212020021 is a wasteful number, since it uses less digits than its factorization.

21110212020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226991527131.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21110212020021 its reverse (12002021201112), we get a palindrome (33112233221133).

The spelling of 21110212020021 in words is "twenty-one trillion, one hundred ten billion, two hundred twelve million, twenty thousand, twenty-one".