210221102100021 has 8 divisors (see below), whose sum is σ = 285045562169760. Its totient is φ = 137772021715152.

The previous prime is 210221102100017. The next prime is 210221102100041. The reversal of 210221102100021 is 120001201122012.

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

It is not a de Polignac number, because 210221102100021 - 2² = 210221102100017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221102100041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593844921010 + ... + 593844921363.

It is an arithmetic number, because the mean of its divisors is an integer number (35630695271220).

Almost surely, 2^{210221102100021} is an apocalyptic number.

It is an amenable number.

210221102100021 is a deficient number, since it is larger than the sum of its proper divisors (74824460069739).

210221102100021 is a wasteful number, since it uses less digits than its factorization.

210221102100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187689842435.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210221102100021 its reverse (120001201122012), we get a palindrome (330222303222033).

The spelling of 210221102100021 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, twenty-one".