21321320122 has 16 divisors (see below), whose sum is σ = 32746174560. Its totient is φ = 10406238192.

The previous prime is 21321320107. The next prime is 21321320129. The reversal of 21321320122 is 22102312312.

It is a self number, because there is not a number n which added to its sum of digits gives 21321320122.

It is not an unprimeable number, because it can be changed into a prime (21321320129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62668 + ... + 215800.

It is an arithmetic number, because the mean of its divisors is an integer number (2046635910).

Almost surely, 2^21321320122 is an apocalyptic number.

21321320122 is a deficient number, since it is larger than the sum of its proper divisors (11424854438).

21321320122 is a wasteful number, since it uses less digits than its factorization.

21321320122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154797.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21321320122 its reverse (22102312312), we get a palindrome (43423632434).

The spelling of 21321320122 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty thousand, one hundred twenty-two".