210201220021 has 8 divisors (see below), whose sum is σ = 226414075160. Its totient is φ = 193994583552.

The previous prime is 210201220003. The next prime is 210201220051. The reversal of 210201220021 is 120022102012.

It is a happy number.

210201220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 82581516900 + 127619703121 = 287370^2 + 357239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210201220021 - 2¹⁷ = 210201088949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 210201219983 and 210201220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210201220051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484340 + ... + 1619773.

It is an arithmetic number, because the mean of its divisors is an integer number (28301759395).

Almost surely, 2^210201220021 is an apocalyptic number.

It is an amenable number.

210201220021 is a deficient number, since it is larger than the sum of its proper divisors (16212855139).

210201220021 is a wasteful number, since it uses less digits than its factorization.

210201220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109335.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210201220021 its reverse (120022102012), we get a palindrome (330223322033).

The spelling of 210201220021 in words is "two hundred ten billion, two hundred one million, two hundred twenty thousand, twenty-one".