21201212012211 has 24 divisors (see below), whose sum is σ = 38180537650944. Its totient is φ = 11013616629360.

The previous prime is 21201212012209. The next prime is 21201212012243. The reversal of 21201212012211 is 11221021210212.

21201212012211 is a `hidden beast` number, since 2 + 120 + 121 + 201 + 221 + 1 = 666.

It is not a de Polignac number, because 21201212012211 - 2¹ = 21201212012209 is a prime.

It is a super-2 number, since 2×21201212012211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201212012011) 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, 15296689071 + ... + 15296690456.

It is an arithmetic number, because the mean of its divisors is an integer number (1590855735456).

Almost surely, 2^{21201212012211} is an apocalyptic number.

21201212012211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21201212012211 is a deficient number, since it is larger than the sum of its proper divisors (16979325638733).

21201212012211 is a wasteful number, since it uses less digits than its factorization.

21201212012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30593379551 (or 30593379548 counting only the distinct ones).

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

Adding to 21201212012211 its reverse (11221021210212), we get a palindrome (32422233222423).

The spelling of 21201212012211 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, twelve thousand, two hundred eleven".