21221202422 has 16 divisors (see below), whose sum is σ = 36404625312. Its totient is φ = 9088445760.

The previous prime is 21221202349. The next prime is 21221202461. The reversal of 21221202422 is 22420212212.

It is a junction number, because it is equal to n+sod(n) for n = 21221202394 and 21221202403.

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, 508829 + ... + 548952.

It is an arithmetic number, because the mean of its divisors is an integer number (2275289082).

Almost surely, 2^21221202422 is an apocalyptic number.

21221202422 is a deficient number, since it is larger than the sum of its proper divisors (15183422890).

21221202422 is a wasteful number, since it uses less digits than its factorization.

21221202422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059223.

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

Adding to 21221202422 its reverse (22420212212), we get a palindrome (43641414634).

The spelling of 21221202422 in words is "twenty-one billion, two hundred twenty-one million, two hundred two thousand, four hundred twenty-two".