21201221012211 has 24 divisors (see below), whose sum is σ = 31590214887504. Its totient is φ = 13691561181120.

The previous prime is 21201221012071. The next prime is 21201221012233. The reversal of 21201221012211 is 11221012210212.

21201221012211 is a `hidden beast` number, since 21 + 201 + 221 + 0 + 1 + 221 + 1 = 666.

It is not a de Polignac number, because 21201221012211 - 2¹⁸ = 21201220750067 is a prime.

It is a super-2 number, since 2×21201221012211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201221012281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140160820 + ... + 140312001.

It is an arithmetic number, because the mean of its divisors is an integer number (1316258953646).

Almost surely, 2^{21201221012211} is an apocalyptic number.

21201221012211 is a deficient number, since it is larger than the sum of its proper divisors (10388993875293).

21201221012211 is a wasteful number, since it uses less digits than its factorization.

21201221012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280473091 (or 280473088 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21201221012211 its reverse (11221012210212), we get a palindrome (32422233222423).

The spelling of 21201221012211 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, two hundred eleven".