621212121212 has 12 divisors (see below), whose sum is σ = 1124608150680. Its totient is φ = 299895506736.

The previous prime is 621212121197. The next prime is 621212121217. The reversal of 621212121212 is 212121212126.

621212121212 is a modest number, since divided by 12121212 gives 6212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621212121217) 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, 2677638338 + ... + 2677638569.

It is an arithmetic number, because the mean of its divisors is an integer number (93717345890).

Almost surely, 2^621212121212 is an apocalyptic number.

It is an amenable number.

621212121212 is a deficient number, since it is larger than the sum of its proper divisors (503396029468).

621212121212 is a wasteful number, since it uses less digits than its factorization.

621212121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355276940 (or 5355276938 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

Adding to 621212121212 its reverse (212121212126), we get a palindrome (833333333338).

The spelling of 621212121212 in words is "six hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".