921681689006 has 16 divisors (see below), whose sum is σ = 1491025110288. Its totient is φ = 424775923200.

The previous prime is 921681688979. The next prime is 921681689069. The reversal of 921681689006 is 600986186129.

It is a happy number.

921681689006 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25632755 + ... + 25668686.

It is an arithmetic number, because the mean of its divisors is an integer number (93189069393).

Almost surely, 2^921681689006 is an apocalyptic number.

921681689006 is a deficient number, since it is larger than the sum of its proper divisors (569343421282).

921681689006 is a wasteful number, since it uses less digits than its factorization.

921681689006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51302147.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 921681689006 in words is "nine hundred twenty-one billion, six hundred eighty-one million, six hundred eighty-nine thousand, six".