21012000022 has 16 divisors (see below), whose sum is σ = 35728907760. Its totient is φ = 9187432992.

The previous prime is 21011999999. The next prime is 21012000049. The reversal of 21012000022 is 22000021012.

It is a junction number, because it is equal to n+sod(n) for n = 21011999972 and 21012000008.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21266713 + ... + 21267700.

It is an arithmetic number, because the mean of its divisors is an integer number (2233056735).

Almost surely, 2^21012000022 is an apocalyptic number.

21012000022 is a deficient number, since it is larger than the sum of its proper divisors (14716907738).

21012000022 is a wasteful number, since it uses less digits than its factorization.

21012000022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42534447.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21012000022 its reverse (22000021012), we get a palindrome (43012021034).

The spelling of 21012000022 in words is "twenty-one billion, twelve million, twenty-two", and thus it is an aban number and an uban number.