210442232220021 has 24 divisors (see below), whose sum is σ = 305832157951320. Its totient is φ = 139436885607936.

The previous prime is 210442232220013. The next prime is 210442232220049. The reversal of 210442232220021 is 120022232244012.

210442232220021 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 422 + 32 + 2 + 200 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 60397984164996 + 150044248055025 = 7771614^2 + 12249255^2 .

It is not a de Polignac number, because 210442232220021 - 2³ = 210442232220013 is a prime.

It is a super-3 number, since 3×210442232220021³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210442232220821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18138936 + ... + 27384401.

It is an arithmetic number, because the mean of its divisors is an integer number (12743006581305).

Almost surely, 2^{210442232220021} is an apocalyptic number.

It is an amenable number.

210442232220021 is a deficient number, since it is larger than the sum of its proper divisors (95389925731299).

210442232220021 is a wasteful number, since it uses less digits than its factorization.

210442232220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45526485 (or 45526482 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 210442232220021 its reverse (120022232244012), we get a palindrome (330464464464033).

The spelling of 210442232220021 in words is "two hundred ten trillion, four hundred forty-two billion, two hundred thirty-two million, two hundred twenty thousand, twenty-one".