21055000122 has 48 divisors (see below), whose sum is σ = 50173643520. Its totient is φ = 6340618656.

The previous prime is 21055000097. The next prime is 21055000159. The reversal of 21055000122 is 22100055012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21055000095 and 21055000104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 946222 + ... + 968217.

It is an arithmetic number, because the mean of its divisors is an integer number (1045284240).

Almost surely, 2^21055000122 is an apocalyptic number.

21055000122 is an abundant number, since it is smaller than the sum of its proper divisors (29118643398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21055000122 is a wasteful number, since it uses less digits than its factorization.

21055000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914507 (or 1914504 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

Adding to 21055000122 its reverse (22100055012), we get a palindrome (43155055134).

The spelling of 21055000122 in words is "twenty-one billion, fifty-five million, one hundred twenty-two", and thus it is an aban number.