21112221002021 has 8 divisors (see below), whose sum is σ = 21486694186944. Its totient is φ = 20740052268000.

The previous prime is 21112221001973. The next prime is 21112221002027. The reversal of 21112221002021 is 12020012221112.

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 21112221002021 - 2¹⁴ = 21112220985637 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 (21112221002027) 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, 576094241 + ... + 576130886.

It is an arithmetic number, because the mean of its divisors is an integer number (2685836773368).

Almost surely, 2^{21112221002021} is an apocalyptic number.

It is an amenable number.

21112221002021 is a deficient number, since it is larger than the sum of its proper divisors (374473184923).

21112221002021 is a wasteful number, since it uses less digits than its factorization.

21112221002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152225451.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21112221002021 its reverse (12020012221112), we get a palindrome (33132233223133).

The spelling of 21112221002021 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two thousand, twenty-one".