21112201012221 has 72 divisors (see below), whose sum is σ = 34776520851072. Its totient is φ = 12789637819200.

The previous prime is 21112201012169. The next prime is 21112201012249. The reversal of 21112201012221 is 12221010221112.

21112201012221 is a `hidden beast` number, since 211 + 1 + 220 + 1 + 0 + 12 + 221 = 666.

It is not a de Polignac number, because 21112201012221 - 2¹⁸ = 21112200750077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112201012194 and 21112201012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112201012321) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 67087681 + ... + 67401641.

Almost surely, 2^{21112201012221} is an apocalyptic number.

It is an amenable number.

21112201012221 is a deficient number, since it is larger than the sum of its proper divisors (13664319838851).

21112201012221 is a wasteful number, since it uses less digits than its factorization.

21112201012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316285 (or 316262 counting only the distinct ones).

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

Adding to 21112201012221 its reverse (12221010221112), we get a palindrome (33333211233333).

The spelling of 21112201012221 in words is "twenty-one trillion, one hundred twelve billion, two hundred one million, twelve thousand, two hundred twenty-one".