21350901606 has 16 divisors (see below), whose sum is σ = 42852696384. Its totient is φ = 7091818344.

The previous prime is 21350901599. The next prime is 21350901661. The reversal of 21350901606 is 60610905312.

It is a happy number.

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, 6285376 + ... + 6288771.

It is an arithmetic number, because the mean of its divisors is an integer number (2678293524).

Almost surely, 2^21350901606 is an apocalyptic number.

21350901606 is an abundant number, since it is smaller than the sum of its proper divisors (21501794778).

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

21350901606 is a wasteful number, since it uses less digits than its factorization.

21350901606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12574435.

The product of its (nonzero) digits is 9720, while the sum is 33.

The spelling of 21350901606 in words is "twenty-one billion, three hundred fifty million, nine hundred one thousand, six hundred six".