21120121201 has 8 divisors (see below), whose sum is σ = 21216742560. Its totient is φ = 21023551392.

The previous prime is 21120121199. The next prime is 21120121229. The reversal of 21120121201 is 10212102112.

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

It is a cyclic number.

It is not a de Polignac number, because 21120121201 - 2¹ = 21120121199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120121291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981706 + ... + 1002988.

It is an arithmetic number, because the mean of its divisors is an integer number (2652092820).

Almost surely, 2^21120121201 is an apocalyptic number.

It is an amenable number.

21120121201 is a deficient number, since it is larger than the sum of its proper divisors (96621359).

21120121201 is a wasteful number, since it uses less digits than its factorization.

21120121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25775.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120121201 its reverse (10212102112), we get a palindrome (31332223313).

The spelling of 21120121201 in words is "twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, two hundred one".