21221000210211 has 16 divisors (see below), whose sum is σ = 28312334987424. Its totient is φ = 14138500045824.

The previous prime is 21221000210203. The next prime is 21221000210269. The reversal of 21221000210211 is 11201200012212.

It is not a de Polignac number, because 21221000210211 - 2³ = 21221000210203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221000260211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196850721 + ... + 196958493.

It is an arithmetic number, because the mean of its divisors is an integer number (1769520936714).

Almost surely, 2^{21221000210211} is an apocalyptic number.

21221000210211 is a deficient number, since it is larger than the sum of its proper divisors (7091334777213).

21221000210211 is a wasteful number, since it uses less digits than its factorization.

21221000210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148150.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221000210211 its reverse (11201200012212), we get a palindrome (32422200222423).

The spelling of 21221000210211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten thousand, two hundred eleven".