21335171308 has 24 divisors (see below), whose sum is σ = 40770760464. Its totient is φ = 9688286400.

The previous prime is 21335171303. The next prime is 21335171317. The reversal of 21335171308 is 80317153312.

It is not an unprimeable number, because it can be changed into a prime (21335171303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192535 + ... + 282382.

It is an arithmetic number, because the mean of its divisors is an integer number (1698781686).

Almost surely, 2^21335171308 is an apocalyptic number.

It is an amenable number.

21335171308 is a deficient number, since it is larger than the sum of its proper divisors (19435589156).

21335171308 is a wasteful number, since it uses less digits than its factorization.

21335171308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475953 (or 475951 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21335171308 in words is "twenty-one billion, three hundred thirty-five million, one hundred seventy-one thousand, three hundred eight".