210111221021 has 16 divisors (see below), whose sum is σ = 227323138560. Its totient is φ = 193049697600.

The previous prime is 210111221009. The next prime is 210111221041. The reversal of 210111221021 is 120122111012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210111221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210111220987 and 210111221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111221041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14946446 + ... + 14960496.

It is an arithmetic number, because the mean of its divisors is an integer number (14207696160).

Almost surely, 2^210111221021 is an apocalyptic number.

It is an amenable number.

210111221021 is a deficient number, since it is larger than the sum of its proper divisors (17211917539).

210111221021 is a wasteful number, since it uses less digits than its factorization.

210111221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19316.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210111221021 its reverse (120122111012), we get a palindrome (330233332033).

The spelling of 210111221021 in words is "two hundred ten billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".