21112453201 has 4 divisors (see below), whose sum is σ = 24128517952. Its totient is φ = 18096388452.

The previous prime is 21112453177. The next prime is 21112453211. The reversal of 21112453201 is 10235421112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112453201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112453211) 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 3 ways as a sum of consecutive naturals, for example, 1508032365 + ... + 1508032378.

It is an arithmetic number, because the mean of its divisors is an integer number (6032129488).

Almost surely, 2^21112453201 is an apocalyptic number.

It is an amenable number.

21112453201 is a deficient number, since it is larger than the sum of its proper divisors (3016064751).

21112453201 is an equidigital number, since it uses as much as digits as its factorization.

21112453201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016064750.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21112453201 its reverse (10235421112), we get a palindrome (31347874313).

The spelling of 21112453201 in words is "twenty-one billion, one hundred twelve million, four hundred fifty-three thousand, two hundred one".