21120144001 has 16 divisors (see below), whose sum is σ = 23269593600. Its totient is φ = 19009209600.

The previous prime is 21120143951. The next prime is 21120144083. The reversal of 21120144001 is 10044102112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21120144001 - 2⁷ = 21120143873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120144091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1719241 + ... + 1731481.

It is an arithmetic number, because the mean of its divisors is an integer number (1454349600).

Almost surely, 2^21120144001 is an apocalyptic number.

It is an amenable number.

21120144001 is a deficient number, since it is larger than the sum of its proper divisors (2149449599).

21120144001 is a wasteful number, since it uses less digits than its factorization.

21120144001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13800.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120144001 its reverse (10044102112), we get a palindrome (31164246113).

The spelling of 21120144001 in words is "twenty-one billion, one hundred twenty million, one hundred forty-four thousand, one".