21022201201 has 4 divisors (see below), whose sum is σ = 21043036900. Its totient is φ = 21001365504.

The previous prime is 21022201177. The next prime is 21022201253. The reversal of 21022201201 is 10210222012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11161711201 + 9860490000 = 105649^2 + 99300^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022201201 - 2¹¹ = 21022199153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022204201) 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, 10416336 + ... + 10418353.

It is an arithmetic number, because the mean of its divisors is an integer number (5260759225).

Almost surely, 2^21022201201 is an apocalyptic number.

It is an amenable number.

21022201201 is a deficient number, since it is larger than the sum of its proper divisors (20835699).

21022201201 is a wasteful number, since it uses less digits than its factorization.

21022201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20835698.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022201201 its reverse (10210222012), we get a palindrome (31232423213).

The spelling of 21022201201 in words is "twenty-one billion, twenty-two million, two hundred one thousand, two hundred one".