210021010021001 has 4 divisors (see below), whose sum is σ = 210156594922500. Its totient is φ = 209885425119504.

The previous prime is 210021010020989. The next prime is 210021010021057. The reversal of 210021010021001 is 100120010120012.

210021010021001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76139934672400 + 133881075348601 = 8725820^2 + 11570699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021010021001 is a prime.

It is a super-2 number, since 2×210021010021001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021010027001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67792448426 + ... + 67792451523.

It is an arithmetic number, because the mean of its divisors is an integer number (52539148730625).

Almost surely, 2^{210021010021001} is an apocalyptic number.

It is an amenable number.

210021010021001 is a deficient number, since it is larger than the sum of its proper divisors (135584901499).

210021010021001 is a wasteful number, since it uses less digits than its factorization.

210021010021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135584901498.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210021010021001 its reverse (100120010120012), we get a palindrome (310141020141013).

The spelling of 210021010021001 in words is "two hundred ten trillion, twenty-one billion, ten million, twenty-one thousand, one".