210121011212 has 24 divisors (see below), whose sum is σ = 420252268800. Its totient is φ = 90049666320.

The previous prime is 210121011181. The next prime is 210121011223. The reversal of 210121011212 is 212110121012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1677539 + ... + 1798437.

It is an arithmetic number, because the mean of its divisors is an integer number (17510511200).

Almost surely, 2^210121011212 is an apocalyptic number.

It is an amenable number.

210121011212 is an abundant number, since it is smaller than the sum of its proper divisors (210131257588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210121011212 is a wasteful number, since it uses less digits than its factorization.

210121011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182981 (or 182979 counting only the distinct ones).

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

Adding to 210121011212 its reverse (212110121012), we get a palindrome (422231132224).

The spelling of 210121011212 in words is "two hundred ten billion, one hundred twenty-one million, eleven thousand, two hundred twelve".