210221220221111 has 8 divisors (see below), whose sum is σ = 231602856482448. Its totient is φ = 189218020000000.

The previous prime is 210221220220933. The next prime is 210221220221189. The reversal of 210221220221111 is 111122022122012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221220221111 is a prime.

It is a super-4 number, since 4×210221220221111⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221220221711) 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, 94609008890 + ... + 94609011111.

It is an arithmetic number, because the mean of its divisors is an integer number (28950357060306).

Almost surely, 2^{210221220221111} is an apocalyptic number.

210221220221111 is a deficient number, since it is larger than the sum of its proper divisors (21381636261337).

210221220221111 is a wasteful number, since it uses less digits than its factorization.

210221220221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189218020113.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 210221220221111 its reverse (111122022122012), we get a palindrome (321343242343123).

The spelling of 210221220221111 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred eleven".