21120322401 has 24 divisors (see below), whose sum is σ = 33012557760. Its totient is φ = 13468028112.

The previous prime is 21120322357. The next prime is 21120322417. The reversal of 21120322401 is 10422302112.

It is a happy number.

21120322401 is a `hidden beast` number, since 211 + 20 + 32 + 2 + 401 = 666.

It is not a de Polignac number, because 21120322401 - 2⁶ = 21120322337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120322441) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1883866 + ... + 1895043.

It is an arithmetic number, because the mean of its divisors is an integer number (1375523240).

Almost surely, 2^21120322401 is an apocalyptic number.

It is an amenable number.

21120322401 is a deficient number, since it is larger than the sum of its proper divisors (11892235359).

21120322401 is an equidigital number, since it uses as much as digits as its factorization.

21120322401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778947 (or 3778935 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21120322401 its reverse (10422302112), we get a palindrome (31542624513).

The spelling of 21120322401 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-two thousand, four hundred one".