21021222010111 has 4 divisors (see below), whose sum is σ = 22257764481312. Its totient is φ = 19784679538912.

The previous prime is 21021222010109. The next prime is 21021222010127. The reversal of 21021222010111 is 11101022212012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21021222010111 - 2¹ = 21021222010109 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 (21021222010171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618271235575 + ... + 618271235608.

It is an arithmetic number, because the mean of its divisors is an integer number (5564441120328).

Almost surely, 2^{21021222010111} is an apocalyptic number.

21021222010111 is a deficient number, since it is larger than the sum of its proper divisors (1236542471201).

21021222010111 is a wasteful number, since it uses less digits than its factorization.

21021222010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236542471200.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021222010111 its reverse (11101022212012), we get a palindrome (32122244222123).

The spelling of 21021222010111 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, ten thousand, one hundred eleven".