21113120401 has 2 divisors, whose sum is σ = 21113120402. Its totient is φ = 21113120400.

The previous prime is 21113120387. The next prime is 21113120459. The reversal of 21113120401 is 10402131112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12678534801 + 8434585600 = 112599^2 + 91840^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113120401 - 2¹¹ = 21113118353 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113120491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556560200 + 10556560201.

It is an arithmetic number, because the mean of its divisors is an integer number (10556560201).

Almost surely, 2^21113120401 is an apocalyptic number.

It is an amenable number.

21113120401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113120401 is an equidigital number, since it uses as much as digits as its factorization.

21113120401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21113120401 its reverse (10402131112), we get a palindrome (31515251513).

The spelling of 21113120401 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, four hundred one".