212121010101213 has 24 divisors (see below), whose sum is σ = 316966451274720. Its totient is φ = 136535928953760.

The previous prime is 212121010101149. The next prime is 212121010101227. The reversal of 212121010101213 is 312101010121212.

It is a happy number.

It is not a de Polignac number, because 212121010101213 - 2⁶ = 212121010101149 is a prime.

It is a super-3 number, since 3×212121010101213³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121010101233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15609070 + ... + 25843472.

It is an arithmetic number, because the mean of its divisors is an integer number (13206935469780).

Almost surely, 2^{212121010101213} is an apocalyptic number.

It is an amenable number.

212121010101213 is a deficient number, since it is larger than the sum of its proper divisors (104845441173507).

212121010101213 is a wasteful number, since it uses less digits than its factorization.

212121010101213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10313849 (or 10313846 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 212121010101213 its reverse (312101010121212), we get a palindrome (524222020222425).

The spelling of 212121010101213 in words is "two hundred twelve trillion, one hundred twenty-one billion, ten million, one hundred one thousand, two hundred thirteen".