21010022120111 has 4 divisors (see below), whose sum is σ = 21013399400424. Its totient is φ = 21006644839800.

The previous prime is 21010022120077. The next prime is 21010022120177. The reversal of 21010022120111 is 11102122001012.

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 21010022120111 - 2¹⁴ = 21010022103727 is a prime.

It is a super-4 number, since 4×21010022120111⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010022120611) 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, 1688630825 + ... + 1688643266.

It is an arithmetic number, because the mean of its divisors is an integer number (5253349850106).

Almost surely, 2^{21010022120111} is an apocalyptic number.

21010022120111 is a deficient number, since it is larger than the sum of its proper divisors (3377280313).

21010022120111 is an equidigital number, since it uses as much as digits as its factorization.

21010022120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377280312.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21010022120111 its reverse (11102122001012), we get a palindrome (32112144121123).

The spelling of 21010022120111 in words is "twenty-one trillion, ten billion, twenty-two million, one hundred twenty thousand, one hundred eleven".