212134443021 has 14 divisors (see below), whose sum is σ = 318056168750. Its totient is φ = 141422961528.

The previous prime is 212134443007. The next prime is 212134443043. The reversal of 212134443021 is 120344431212.

212134443021 is a `hidden beast` number, since 2 + 1 + 213 + 4 + 443 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 211052954025 + 1081488996 = 459405^2 + 32886^2 .

It is not a de Polignac number, because 212134443021 - 2¹³ = 212134434829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212134443061) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 145496146 + ... + 145497603.

Almost surely, 2^212134443021 is an apocalyptic number.

It is an amenable number.

212134443021 is a deficient number, since it is larger than the sum of its proper divisors (105921725729).

212134443021 is an frugal number, since it uses more digits than its factorization.

212134443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290993767 (or 290993752 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 212134443021 its reverse (120344431212), we get a palindrome (332478874233).

The spelling of 212134443021 in words is "two hundred twelve billion, one hundred thirty-four million, four hundred forty-three thousand, twenty-one".