21000120022 has 24 divisors (see below), whose sum is σ = 36648079776. Its totient is φ = 8998820208.

The previous prime is 21000120013. The next prime is 21000120041. The reversal of 21000120022 is 22002100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000119990 and 21000120008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1354788 + ... + 1370200.

It is an arithmetic number, because the mean of its divisors is an integer number (1527003324).

Almost surely, 2^21000120022 is an apocalyptic number.

21000120022 is a deficient number, since it is larger than the sum of its proper divisors (15647959754).

21000120022 is a wasteful number, since it uses less digits than its factorization.

21000120022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29332 (or 29325 counting only the distinct ones).

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

Adding to 21000120022 its reverse (22002100012), we get a palindrome (43002220034).

The spelling of 21000120022 in words is "twenty-one billion, one hundred twenty thousand, twenty-two".