210021111222101 has 4 divisors (see below), whose sum is σ = 210569469215232. Its totient is φ = 209472753228972.

The previous prime is 210021111222061. The next prime is 210021111222133. The reversal of 210021111222101 is 101222111120012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021111222101 is a prime.

It is a super-2 number, since 2×210021111222101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021111222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021111222151) 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, 274178995991 + ... + 274178996756.

It is an arithmetic number, because the mean of its divisors is an integer number (52642367303808).

Almost surely, 2^{210021111222101} is an apocalyptic number.

It is an amenable number.

210021111222101 is a deficient number, since it is larger than the sum of its proper divisors (548357993131).

210021111222101 is an equidigital number, since it uses as much as digits as its factorization.

210021111222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548357993130.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210021111222101 its reverse (101222111120012), we get a palindrome (311243222342113).

The spelling of 210021111222101 in words is "two hundred ten trillion, twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred one".