21022120218 has 64 divisors (see below), whose sum is σ = 46154188800. Its totient is φ = 6330495360.

The previous prime is 21022120211. The next prime is 21022120237. The reversal of 21022120218 is 81202122012.

It is a junction number, because it is equal to n+sod(n) for n = 21022120194 and 21022120203.

It is not an unprimeable number, because it can be changed into a prime (21022120211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9763030 + ... + 9765182.

It is an arithmetic number, because the mean of its divisors is an integer number (721159200).

Almost surely, 2^21022120218 is an apocalyptic number.

21022120218 is an abundant number, since it is smaller than the sum of its proper divisors (25132068582).

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

21022120218 is a wasteful number, since it uses less digits than its factorization.

21022120218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027.

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 21022120218 in words is "twenty-one billion, twenty-two million, one hundred twenty thousand, two hundred eighteen".