212121212221004 has 12 divisors (see below), whose sum is σ = 371370016818528. Its totient is φ = 106015493130000.

The previous prime is 212121212221003. The next prime is 212121212221117. The reversal of 212121212221004 is 400122212121212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (212121212221001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11278234547 + ... + 11278253354.

It is an arithmetic number, because the mean of its divisors is an integer number (30947501401544).

Almost surely, 2^{212121212221004} is an apocalyptic number.

It is an amenable number.

212121212221004 is a deficient number, since it is larger than the sum of its proper divisors (159248804597524).

212121212221004 is a wasteful number, since it uses less digits than its factorization.

212121212221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22556490256 (or 22556490254 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 212121212221004 its reverse (400122212121212), we get a palindrome (612243424342216).

The spelling of 212121212221004 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, four".