21110200202021 has 8 divisors (see below), whose sum is σ = 24126113406720. Its totient is φ = 18094329577008.

The previous prime is 21110200201999. The next prime is 21110200202027. The reversal of 21110200202021 is 12020200201112.

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 21110200202021 - 2²⁶ = 21110133093157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110200201987 and 21110200202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110200202027) 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, 9575366 + ... + 11571863.

It is an arithmetic number, because the mean of its divisors is an integer number (3015764175840).

Almost surely, 2^{21110200202021} is an apocalyptic number.

It is an amenable number.

21110200202021 is a deficient number, since it is larger than the sum of its proper divisors (3015913204699).

21110200202021 is a wasteful number, since it uses less digits than its factorization.

21110200202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21289843.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21110200202021 its reverse (12020200201112), we get a palindrome (33130400403133).

Subtracting from 21110200202021 its reverse (12020200201112), we obtain a palindrome (9090000000909).

The spelling of 21110200202021 in words is "twenty-one trillion, one hundred ten billion, two hundred million, two hundred two thousand, twenty-one".