21022123311 has 24 divisors (see below), whose sum is σ = 34707404160. Its totient is φ = 12011182416.

The previous prime is 21022123301. The next prime is 21022123319. The reversal of 21022123311 is 11332122012.

21022123311 is a `hidden beast` number, since 210 + 22 + 123 + 311 = 666.

It is not a de Polignac number, because 21022123311 - 2²⁷ = 20887905583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022123319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 708900 + ... + 737958.

It is an arithmetic number, because the mean of its divisors is an integer number (1446141840).

Almost surely, 2^21022123311 is an apocalyptic number.

21022123311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21022123311 is a deficient number, since it is larger than the sum of its proper divisors (13685280849).

21022123311 is a wasteful number, since it uses less digits than its factorization.

21022123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40555 (or 40552 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21022123311 its reverse (11332122012), we get a palindrome (32354245323).

The spelling of 21022123311 in words is "twenty-one billion, twenty-two million, one hundred twenty-three thousand, three hundred eleven".