21443121201 has 16 divisors (see below), whose sum is σ = 28844928000. Its totient is φ = 14168710608.

The previous prime is 21443121199. The next prime is 21443121209. The reversal of 21443121201 is 10212134412.

It is not a de Polignac number, because 21443121201 - 2¹ = 21443121199 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21443121209) 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, 206860 + ... + 292706.

It is an arithmetic number, because the mean of its divisors is an integer number (1802808000).

Almost surely, 2^21443121201 is an apocalyptic number.

It is an amenable number.

21443121201 is a deficient number, since it is larger than the sum of its proper divisors (7401806799).

21443121201 is a wasteful number, since it uses less digits than its factorization.

21443121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86588.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21443121201 its reverse (10212134412), we get a palindrome (31655255613).

The spelling of 21443121201 in words is "twenty-one billion, four hundred forty-three million, one hundred twenty-one thousand, two hundred one".