21100222022 has 32 divisors (see below), whose sum is σ = 35142750720. Its totient is φ = 9421382880.

The previous prime is 21100221997. The next prime is 21100222043. The reversal of 21100222022 is 22022200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100221988 and 21100222006.

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 15 ways as a sum of consecutive naturals, for example, 311573 + ... + 373199.

It is an arithmetic number, because the mean of its divisors is an integer number (1098210960).

Almost surely, 2^21100222022 is an apocalyptic number.

21100222022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21100222022 is a deficient number, since it is larger than the sum of its proper divisors (14042528698).

21100222022 is a wasteful number, since it uses less digits than its factorization.

21100222022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61916.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21100222022 its reverse (22022200112), we get a palindrome (43122422134).

The spelling of 21100222022 in words is "twenty-one billion, one hundred million, two hundred twenty-two thousand, twenty-two".