21320421122 has 96 divisors (see below), whose sum is σ = 43292962944. Its totient is φ = 7646745600.

The previous prime is 21320421097. The next prime is 21320421169. The reversal of 21320421122 is 22112402312.

It is a junction number, because it is equal to n+sod(n) for n = 21320421094 and 21320421103.

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 47 ways as a sum of consecutive naturals, for example, 11997098 + ... + 11998874.

It is an arithmetic number, because the mean of its divisors is an integer number (450968364).

Almost surely, 2^21320421122 is an apocalyptic number.

21320421122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21320421122 is an abundant number, since it is smaller than the sum of its proper divisors (21972541822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21320421122 is a wasteful number, since it uses less digits than its factorization.

21320421122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284 (or 2271 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21320421122 its reverse (22112402312), we get a palindrome (43432823434).

The spelling of 21320421122 in words is "twenty-one billion, three hundred twenty million, four hundred twenty-one thousand, one hundred twenty-two".