21071020108 has 6 divisors (see below), whose sum is σ = 36874285196. Its totient is φ = 10535510052.

The previous prime is 21071020097. The next prime is 21071020123. The reversal of 21071020108 is 80102017012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2633877510 + ... + 2633877517.

Almost surely, 2^21071020108 is an apocalyptic number.

It is an amenable number.

21071020108 is a deficient number, since it is larger than the sum of its proper divisors (15803265088).

21071020108 is a wasteful number, since it uses less digits than its factorization.

21071020108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267755031 (or 5267755029 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The spelling of 21071020108 in words is "twenty-one billion, seventy-one million, twenty thousand, one hundred eight".