21120240001 has 32 divisors (see below), whose sum is σ = 25826088960. Its totient is φ = 16870104576.

The previous prime is 21120239977. The next prime is 21120240013. The reversal of 21120240001 is 10004202112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21120240001 - 2⁷ = 21120239873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120240041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2149566 + ... + 2159368.

It is an arithmetic number, because the mean of its divisors is an integer number (807065280).

Almost surely, 2^21120240001 is an apocalyptic number.

It is an amenable number.

21120240001 is a deficient number, since it is larger than the sum of its proper divisors (4705848959).

21120240001 is a wasteful number, since it uses less digits than its factorization.

21120240001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10093.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21120240001 its reverse (10004202112), we get a palindrome (31124442113).

It can be divided in two parts, 21120 and 240001, that added together give a square (261121 = 511²).

The spelling of 21120240001 in words is "twenty-one billion, one hundred twenty million, two hundred forty thousand, one".