21133222001 has 4 divisors (see below), whose sum is σ = 21150645492. Its totient is φ = 21115798512.

The previous prime is 21133221959. The next prime is 21133222003. The reversal of 21133222001 is 10022233112.

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 12695880976 + 8437341025 = 112676^2 + 91855^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133222001 - 2¹⁸ = 21132959857 is a prime.

It is a super-2 number, since 2×21133222001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133222003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8709926 + ... + 8712351.

It is an arithmetic number, because the mean of its divisors is an integer number (5287661373).

Almost surely, 2^21133222001 is an apocalyptic number.

It is an amenable number.

21133222001 is a deficient number, since it is larger than the sum of its proper divisors (17423491).

21133222001 is a wasteful number, since it uses less digits than its factorization.

21133222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17423490.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21133222001 its reverse (10022233112), we get a palindrome (31155455113).

The spelling of 21133222001 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-two thousand, one".