21211221012201 has 36 divisors (see below), whose sum is σ = 34351501517424. Its totient is φ = 12507845234400.

The previous prime is 21211221012199. The next prime is 21211221012209. The reversal of 21211221012201 is 10221012211212.

21211221012201 is a `hidden beast` number, since 21 + 211 + 2 + 210 + 1 + 220 + 1 = 666.

It is not a de Polignac number, because 21211221012201 - 2¹ = 21211221012199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211221012209) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 78116755 + ... + 78387816.

It is an arithmetic number, because the mean of its divisors is an integer number (954208375484).

Almost surely, 2^{21211221012201} is an apocalyptic number.

It is an amenable number.

21211221012201 is a deficient number, since it is larger than the sum of its proper divisors (13140280505223).

21211221012201 is a wasteful number, since it uses less digits than its factorization.

21211221012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156504662 (or 156504622 counting only the distinct ones).

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

Adding to 21211221012201 its reverse (10221012211212), we get a palindrome (31432233223413).

The spelling of 21211221012201 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, twelve thousand, two hundred one".