21222401222 has 16 divisors (see below), whose sum is σ = 35574580944. Its totient is φ = 9411264000.

The previous prime is 21222401203. The next prime is 21222401243. The reversal of 21222401222 is 22210422212.

It is a junction number, because it is equal to n+sod(n) for n = 21222401194 and 21222401203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11763179 + ... + 11764982.

It is an arithmetic number, because the mean of its divisors is an integer number (2223411309).

Almost surely, 2^21222401222 is an apocalyptic number.

21222401222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21222401222 is a deficient number, since it is larger than the sum of its proper divisors (14352179722).

21222401222 is a wasteful number, since it uses less digits than its factorization.

21222401222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23528215.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21222401222 its reverse (22210422212), we get a palindrome (43432823434).

The spelling of 21222401222 in words is "twenty-one billion, two hundred twenty-two million, four hundred one thousand, two hundred twenty-two".