211212010221021 has 96 divisors (see below), whose sum is σ = 328546171699200. Its totient is φ = 135451401301440.

The previous prime is 211212010221019. The next prime is 211212010221061. The reversal of 211212010221021 is 120122010212112.

211212010221021 is a `hidden beast` number, since 211 + 2 + 120 + 102 + 210 + 21 = 666.

It is not a de Polignac number, because 211212010221021 - 2¹ = 211212010221019 is a prime.

It is a super-2 number, since 2×211212010221021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212010220985 and 211212010221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212010221061) 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 95 ways as a sum of consecutive naturals, for example, 1002710250 + ... + 1002920868.

It is an arithmetic number, because the mean of its divisors is an integer number (3422355955200).

Almost surely, 2^{211212010221021} is an apocalyptic number.

It is an amenable number.

211212010221021 is a deficient number, since it is larger than the sum of its proper divisors (117334161478179).

211212010221021 is a wasteful number, since it uses less digits than its factorization.

211212010221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211461 (or 211449 counting only the distinct ones).

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

Adding to 211212010221021 its reverse (120122010212112), we get a palindrome (331334020433133).

The spelling of 211212010221021 in words is "two hundred eleven trillion, two hundred twelve billion, ten million, two hundred twenty-one thousand, twenty-one".