210100221000021 has 128 divisors (see below), whose sum is σ = 329008248299520. Its totient is φ = 117848480256000.

The previous prime is 210100220999989. The next prime is 210100221000049. The reversal of 210100221000021 is 120000122001012.

210100221000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210100221000021 - 2⁵ = 210100220999989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210100220999970 and 210100221000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210100221000091) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 28991333620 + ... + 28991340866.

It is an arithmetic number, because the mean of its divisors is an integer number (2570376939840).

Almost surely, 2^{210100221000021} is an apocalyptic number.

It is an amenable number.

210100221000021 is a deficient number, since it is larger than the sum of its proper divisors (118908027299499).

210100221000021 is a wasteful number, since it uses less digits than its factorization.

210100221000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10795.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210100221000021 its reverse (120000122001012), we get a palindrome (330100343001033).

The spelling of 210100221000021 in words is "two hundred ten trillion, one hundred billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.