21001231201 has 8 divisors (see below), whose sum is σ = 21752688384. Its totient is φ = 20254398960.

The previous prime is 21001231187. The next prime is 21001231211. The reversal of 21001231201 is 10213210012.

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 21001231201 - 2¹⁵ = 21001198433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001231211) 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, 1146991 + ... + 1165156.

It is an arithmetic number, because the mean of its divisors is an integer number (2719086048).

Almost surely, 2^21001231201 is an apocalyptic number.

It is an amenable number.

21001231201 is a deficient number, since it is larger than the sum of its proper divisors (751457183).

21001231201 is a wasteful number, since it uses less digits than its factorization.

21001231201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312471.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21001231201 its reverse (10213210012), we get a palindrome (31214441213).

The spelling of 21001231201 in words is "twenty-one billion, one million, two hundred thirty-one thousand, two hundred one".