21244012201 has 4 divisors (see below), whose sum is σ = 21244309632. Its totient is φ = 21243714772.

The previous prime is 21244012189. The next prime is 21244012211. The reversal of 21244012201 is 10221044212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21244012201 - 2¹¹ = 21244010153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244012211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30060 + ... + 208306.

It is an arithmetic number, because the mean of its divisors is an integer number (5311077408).

Almost surely, 2^21244012201 is an apocalyptic number.

It is an amenable number.

21244012201 is a deficient number, since it is larger than the sum of its proper divisors (297431).

21244012201 is a wasteful number, since it uses less digits than its factorization.

21244012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297430.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21244012201 its reverse (10221044212), we get a palindrome (31465056413).

The spelling of 21244012201 in words is "twenty-one billion, two hundred forty-four million, twelve thousand, two hundred one".