21211222012101 has 20 divisors (see below), whose sum is σ = 34566435873024. Its totient is φ = 12855286067400.

The previous prime is 21211222012093. The next prime is 21211222012117. The reversal of 21211222012101 is 10121022211212.

21211222012101 is a `hidden beast` number, since 21 + 211 + 2 + 220 + 1 + 210 + 1 = 666.

It is not a de Polignac number, because 21211222012101 - 2³ = 21211222012093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222012121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11903041765 + ... + 11903043546.

Almost surely, 2^{21211222012101} is an apocalyptic number.

It is an amenable number.

21211222012101 is a deficient number, since it is larger than the sum of its proper divisors (13355213860923).

21211222012101 is a wasteful number, since it uses less digits than its factorization.

21211222012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23806085334 (or 23806085325 counting only the distinct ones).

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

Adding to 21211222012101 its reverse (10121022211212), we get a palindrome (31332244223313).

The spelling of 21211222012101 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, twelve thousand, one hundred one".