21022112021111 has 4 divisors (see below), whose sum is σ = 21022380810912. Its totient is φ = 21021843231312.

The previous prime is 21022112021023. The next prime is 21022112021117. The reversal of 21022112021111 is 11112021122012.

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 21022112021111 - 2¹⁴ = 21022112004727 is a prime.

It is a super-2 number, since 2×21022112021111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022112021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022112021117) 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, 134277551 + ... + 134434016.

It is an arithmetic number, because the mean of its divisors is an integer number (5255595202728).

Almost surely, 2^{21022112021111} is an apocalyptic number.

21022112021111 is a deficient number, since it is larger than the sum of its proper divisors (268789801).

21022112021111 is an equidigital number, since it uses as much as digits as its factorization.

21022112021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268789800.

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

Adding to 21022112021111 its reverse (11112021122012), we get a palindrome (32134133143123).

The spelling of 21022112021111 in words is "twenty-one trillion, twenty-two billion, one hundred twelve million, twenty-one thousand, one hundred eleven".