21154386308 has 24 divisors (see below), whose sum is σ = 40390793184. Its totient is φ = 9614404800.

The previous prime is 21154386289. The next prime is 21154386343. The reversal of 21154386308 is 80368345112.

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, 380591 + ... + 432617.

It is an arithmetic number, because the mean of its divisors is an integer number (1682949716).

Almost surely, 2^21154386308 is an apocalyptic number.

It is an amenable number.

21154386308 is a deficient number, since it is larger than the sum of its proper divisors (19236406876).

21154386308 is a wasteful number, since it uses less digits than its factorization.

21154386308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61283 (or 61281 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 21154386308 in words is "twenty-one billion, one hundred fifty-four million, three hundred eighty-six thousand, three hundred eight".