21000222122 has 32 divisors (see below), whose sum is σ = 34517957760. Its totient is φ = 9502894080.

The previous prime is 21000222101. The next prime is 21000222211. The reversal of 21000222122 is 22122200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000222097 and 21000222106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4894154 + ... + 4898442.

It is an arithmetic number, because the mean of its divisors is an integer number (1078686180).

Almost surely, 2^21000222122 is an apocalyptic number.

21000222122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000222122 is a deficient number, since it is larger than the sum of its proper divisors (13517735638).

21000222122 is a wasteful number, since it uses less digits than its factorization.

21000222122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246.

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

Adding to 21000222122 its reverse (22122200012), we get a palindrome (43122422134).

The spelling of 21000222122 in words is "twenty-one billion, two hundred twenty-two thousand, one hundred twenty-two".