210221221220001 has 24 divisors (see below), whose sum is σ = 306698964422760. Its totient is φ = 138741952032000.

The previous prime is 210221221219957. The next prime is 210221221220009. The reversal of 210221221220001 is 100022122122012.

It is a happy number.

210221221220001 is a `hidden beast` number, since 2 + 1 + 0 + 221 + 221 + 220 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 40725584355600 + 169495636864401 = 6381660^2 + 13019049^2 .

It is not a de Polignac number, because 210221221220001 - 2⁷ = 210221221219873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210221221220009) 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, 7901196 + ... + 21974333.

It is an arithmetic number, because the mean of its divisors is an integer number (12779123517615).

Almost surely, 2^{210221221220001} is an apocalyptic number.

It is an amenable number.

210221221220001 is a deficient number, since it is larger than the sum of its proper divisors (96477743202759).

210221221220001 is a wasteful number, since it uses less digits than its factorization.

210221221220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29883377 (or 29883374 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210221221220001 its reverse (100022122122012), we get a palindrome (310243343342013).

The spelling of 210221221220001 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, one".