21020022201 has 4 divisors (see below), whose sum is σ = 28026696272. Its totient is φ = 14013348132.

The previous prime is 21020022187. The next prime is 21020022209. The reversal of 21020022201 is 10222002012.

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 not a de Polignac number, because 21020022201 - 2¹⁰ = 21020021177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020022209) 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, 3503337031 + ... + 3503337036.

It is an arithmetic number, because the mean of its divisors is an integer number (7006674068).

Almost surely, 2^21020022201 is an apocalyptic number.

It is an amenable number.

21020022201 is a deficient number, since it is larger than the sum of its proper divisors (7006674071).

21020022201 is an equidigital number, since it uses as much as digits as its factorization.

21020022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006674070.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21020022201 its reverse (10222002012), we get a palindrome (31242024213).

The spelling of 21020022201 in words is "twenty-one billion, twenty million, twenty-two thousand, two hundred one".