212121102111012 has 36 divisors (see below), whose sum is σ = 536200773522960. Its totient is φ = 70706273763312.

The previous prime is 212121102110987. The next prime is 212121102111013. The reversal of 212121102111012 is 210111201121212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×212121102111012³ (a number of 44 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (212121102111013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28278498 + ... + 34984505.

Almost surely, 2^{212121102111012} is an apocalyptic number.

It is an amenable number.

212121102111012 is an abundant number, since it is smaller than the sum of its proper divisors (324079671411948).

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

212121102111012 is a wasteful number, since it uses less digits than its factorization.

212121102111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63356152 (or 63356147 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212121102111012 its reverse (210111201121212), we get a palindrome (422232303232224).

The spelling of 212121102111012 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred two million, one hundred eleven thousand, twelve".