210012111221 has 16 divisors (see below), whose sum is σ = 229456281600. Its totient is φ = 190626836400.

The previous prime is 210012111203. The next prime is 210012111229. The reversal of 210012111221 is 122111210012.

It is not a de Polignac number, because 210012111221 - 2²² = 210007916917 is a prime.

It is a super-2 number, since 2×210012111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210012111196 and 210012111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012111229) 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, 41674820 + ... + 41679858.

It is an arithmetic number, because the mean of its divisors is an integer number (14341017600).

Almost surely, 2^210012111221 is an apocalyptic number.

It is an amenable number.

210012111221 is a deficient number, since it is larger than the sum of its proper divisors (19444170379).

210012111221 is a wasteful number, since it uses less digits than its factorization.

210012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120.

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

Adding to 210012111221 its reverse (122111210012), we get a palindrome (332123321233).

The spelling of 210012111221 in words is "two hundred ten billion, twelve million, one hundred eleven thousand, two hundred twenty-one".