21020100222201 has 4 divisors (see below), whose sum is σ = 28026800296272. Its totient is φ = 14013400148132.

The previous prime is 21020100222167. The next prime is 21020100222211. The reversal of 21020100222201 is 10222200102012.

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.

It is a cyclic number.

It is not a de Polignac number, because 21020100222201 - 2⁷ = 21020100222073 is a prime.

It is a super-2 number, since 2×21020100222201² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020100222211) 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, 3503350037031 + ... + 3503350037036.

It is an arithmetic number, because the mean of its divisors is an integer number (7006700074068).

Almost surely, 2^{21020100222201} is an apocalyptic number.

It is an amenable number.

21020100222201 is a deficient number, since it is larger than the sum of its proper divisors (7006700074071).

21020100222201 is an equidigital number, since it uses as much as digits as its factorization.

21020100222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006700074070.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020100222201 its reverse (10222200102012), we get a palindrome (31242300324213).

The spelling of 21020100222201 in words is "twenty-one trillion, twenty billion, one hundred million, two hundred twenty-two thousand, two hundred one".