21121232201 has 8 divisors (see below), whose sum is σ = 21805334784. Its totient is φ = 20437302960.

The previous prime is 21121232183. The next prime is 21121232213. The reversal of 21121232201 is 10223212112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121232201 is a prime.

It is a super-2 number, since 2×21121232201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121232201.

It is not an unprimeable number, because it can be changed into a prime (21121232401) 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 7 ways as a sum of consecutive naturals, for example, 232211 + ... + 310103.

It is an arithmetic number, because the mean of its divisors is an integer number (2725666848).

Almost surely, 2^21121232201 is an apocalyptic number.

It is an amenable number.

21121232201 is a deficient number, since it is larger than the sum of its proper divisors (684102583).

21121232201 is an equidigital number, since it uses as much as digits as its factorization.

21121232201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86671.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121232201 its reverse (10223212112), we get a palindrome (31344444313).

The spelling of 21121232201 in words is "twenty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, two hundred one".