21110022021 has 16 divisors (see below), whose sum is σ = 31022042688. Its totient is φ = 12662054400.

The previous prime is 21110022013. The next prime is 21110022041. The reversal of 21110022021 is 12022001112.

It is not a de Polignac number, because 21110022021 - 2³ = 21110022013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21110021988 and 21110022006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110022041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3294210 + ... + 3300611.

It is an arithmetic number, because the mean of its divisors is an integer number (1938877668).

Almost surely, 2^21110022021 is an apocalyptic number.

It is an amenable number.

21110022021 is a deficient number, since it is larger than the sum of its proper divisors (9912020667).

21110022021 is a wasteful number, since it uses less digits than its factorization.

21110022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6594932.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110022021 its reverse (12022001112), we get a palindrome (33132023133).

The spelling of 21110022021 in words is "twenty-one billion, one hundred ten million, twenty-two thousand, twenty-one".