21210022020211 has 4 divisors (see below), whose sum is σ = 21230202822424. Its totient is φ = 21189841218000.

The previous prime is 21210022020163. The next prime is 21210022020233. The reversal of 21210022020211 is 11202022001212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210022020211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210022021211) 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, 10090399530 + ... + 10090401631.

It is an arithmetic number, because the mean of its divisors is an integer number (5307550705606).

Almost surely, 2^{21210022020211} is an apocalyptic number.

21210022020211 is a deficient number, since it is larger than the sum of its proper divisors (20180802213).

21210022020211 is a wasteful number, since it uses less digits than its factorization.

21210022020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20180802212.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210022020211 its reverse (11202022001212), we get a palindrome (32412044021423).

The spelling of 21210022020211 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, twenty thousand, two hundred eleven".