21221330201211 has 16 divisors (see below), whose sum is σ = 32447631170304. Its totient is φ = 12085087112544.

The previous prime is 21221330201191. The next prime is 21221330201237. The reversal of 21221330201211 is 11210203312212.

It is not a de Polignac number, because 21221330201211 - 2¹¹ = 21221330199163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21221330201251) 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, 1724464041 + ... + 1724476346.

It is an arithmetic number, because the mean of its divisors is an integer number (2027976948144).

Almost surely, 2^{21221330201211} is an apocalyptic number.

21221330201211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21221330201211 is a deficient number, since it is larger than the sum of its proper divisors (11226300969093).

21221330201211 is a wasteful number, since it uses less digits than its factorization.

21221330201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3448940690.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21221330201211 its reverse (11210203312212), we get a palindrome (32431533513423).

The spelling of 21221330201211 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred thirty million, two hundred one thousand, two hundred eleven".