3921212688 has 80 divisors (see below), whose sum is σ = 10404244800. Its totient is φ = 1272102400.

The previous prime is 3921212683. The next prime is 3921212717. The reversal of 3921212688 is 8862121293.

3921212688 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3921212683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279178 + ... + 292886.

It is an arithmetic number, because the mean of its divisors is an integer number (130053060).

Almost surely, 2^3921212688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3921212688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5202122400).

3921212688 is an abundant number, since it is smaller than the sum of its proper divisors (6483032112).

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

3921212688 is a wasteful number, since it uses less digits than its factorization.

3921212688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13880 (or 13874 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 3921212688 is about 62619.5870954129. The cubic root of 3921212688 is about 1576.9096095823.

The spelling of 3921212688 in words is "three billion, nine hundred twenty-one million, two hundred twelve thousand, six hundred eighty-eight".