21201122022 has 64 divisors (see below), whose sum is σ = 45740851200. Its totient is φ = 6532020000.

The previous prime is 21201121973. The next prime is 21201122023. The reversal of 21201122022 is 22022110212.

It is a junction number, because it is equal to n+sod(n) for n = 21201121992 and 21201122010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201122023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3209479 + ... + 3216077.

It is an arithmetic number, because the mean of its divisors is an integer number (714700800).

Almost surely, 2^21201122022 is an apocalyptic number.

21201122022 is an abundant number, since it is smaller than the sum of its proper divisors (24539729178).

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

21201122022 is a wasteful number, since it uses less digits than its factorization.

21201122022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7409.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21201122022 its reverse (22022110212), we get a palindrome (43223232234).

The spelling of 21201122022 in words is "twenty-one billion, two hundred one million, one hundred twenty-two thousand, twenty-two".