21010122111 has 16 divisors (see below), whose sum is σ = 30862758528. Its totient is φ = 12607332000.

The previous prime is 21010122079. The next prime is 21010122121. The reversal of 21010122111 is 11122101012.

It is not a de Polignac number, because 21010122111 - 2⁵ = 21010122079 is a prime.

It is a super-2 number, since 2×21010122111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010122121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3148501 + ... + 3155166.

It is an arithmetic number, because the mean of its divisors is an integer number (1928922408).

Almost surely, 2^21010122111 is an apocalyptic number.

21010122111 is a deficient number, since it is larger than the sum of its proper divisors (9852636417).

21010122111 is a wasteful number, since it uses less digits than its factorization.

21010122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6303782.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21010122111 its reverse (11122101012), we get a palindrome (32132223123).

The spelling of 21010122111 in words is "twenty-one billion, ten million, one hundred twenty-two thousand, one hundred eleven".