21022022201221 has 4 divisors (see below), whose sum is σ = 21022972199500. Its totient is φ = 21021072202944.

The previous prime is 21022022201179. The next prime is 21022022201239. The reversal of 21022022201221 is 12210222022012.

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 17000036072100 + 4021986129121 = 4123110^2 + 2005489^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022022201221 - 2⁷ = 21022022201093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022022201021) 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, 474965946 + ... + 475010203.

It is an arithmetic number, because the mean of its divisors is an integer number (5255743049875).

Almost surely, 2^{21022022201221} is an apocalyptic number.

It is an amenable number.

21022022201221 is a deficient number, since it is larger than the sum of its proper divisors (949998279).

21022022201221 is an equidigital number, since it uses as much as digits as its factorization.

21022022201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949998278.

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

Adding to 21022022201221 its reverse (12210222022012), we get a palindrome (33232244223233).

The spelling of 21022022201221 in words is "twenty-one trillion, twenty-two billion, twenty-two million, two hundred one thousand, two hundred twenty-one".