21120017022 has 24 divisors (see below), whose sum is σ = 49280040264. Its totient is φ = 6498466704.

The previous prime is 21120017003. The next prime is 21120017081. The reversal of 21120017022 is 22071002112.

It is a happy number.

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 = 21120016986 and 21120017004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45128008 + ... + 45128475.

It is an arithmetic number, because the mean of its divisors is an integer number (2053335011).

Almost surely, 2^21120017022 is an apocalyptic number.

21120017022 is an abundant number, since it is smaller than the sum of its proper divisors (28160023242).

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

21120017022 is a wasteful number, since it uses less digits than its factorization.

21120017022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90256504 (or 90256501 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

Adding to 21120017022 its reverse (22071002112), we get a palindrome (43191019134).

The spelling of 21120017022 in words is "twenty-one billion, one hundred twenty million, seventeen thousand, twenty-two".