21002222022211 has 4 divisors (see below), whose sum is σ = 21141309585424. Its totient is φ = 20863134459000.

The previous prime is 21002222022209. The next prime is 21002222022217. The reversal of 21002222022211 is 11222022220012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002222022211 - 2¹ = 21002222022209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002222022217) 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, 69543781380 + ... + 69543781681.

It is an arithmetic number, because the mean of its divisors is an integer number (5285327396356).

Almost surely, 2^{21002222022211} is an apocalyptic number.

21002222022211 is a deficient number, since it is larger than the sum of its proper divisors (139087563213).

21002222022211 is a wasteful number, since it uses less digits than its factorization.

21002222022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139087563212.

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

Adding to 21002222022211 its reverse (11222022220012), we get a palindrome (32224244242223).

The spelling of 21002222022211 in words is "twenty-one trillion, two billion, two hundred twenty-two million, twenty-two thousand, two hundred eleven".