21011222122 has 16 divisors (see below), whose sum is σ = 34399118592. Its totient is φ = 9545800320.

The previous prime is 21011222101. The next prime is 21011222149. The reversal of 21011222122 is 22122211012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21011222096 and 21011222105.

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 7 ways as a sum of consecutive naturals, for example, 192378 + ... + 281125.

It is an arithmetic number, because the mean of its divisors is an integer number (2149944912).

Almost surely, 2^21011222122 is an apocalyptic number.

21011222122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21011222122 is a deficient number, since it is larger than the sum of its proper divisors (13387896470).

21011222122 is a wasteful number, since it uses less digits than its factorization.

21011222122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475533.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21011222122 its reverse (22122211012), we get a palindrome (43133433134).

The spelling of 21011222122 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, one hundred twenty-two".