21112211102021 has 8 divisors (see below), whose sum is σ = 23724758964480. Its totient is φ = 18640882042992.

The previous prime is 21112211102009. The next prime is 21112211102029. The reversal of 21112211102021 is 12020111221112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21112211102021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112211102029) 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, 35304700541 + ... + 35304701138.

It is an arithmetic number, because the mean of its divisors is an integer number (2965594870560).

Almost surely, 2^{21112211102021} is an apocalyptic number.

It is an amenable number.

21112211102021 is a deficient number, since it is larger than the sum of its proper divisors (2612547862459).

21112211102021 is a wasteful number, since it uses less digits than its factorization.

21112211102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70609401715.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21112211102021 its reverse (12020111221112), we get a palindrome (33132322323133).

The spelling of 21112211102021 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred two thousand, twenty-one".