21071751902 has 8 divisors (see below), whose sum is σ = 31636132200. Its totient is φ = 10526374504.

The previous prime is 21071751901. The next prime is 21071751913. The reversal of 21071751902 is 20915717012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071751901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4747952 + ... + 4752387.

It is an arithmetic number, because the mean of its divisors is an integer number (3954516525).

Almost surely, 2^21071751902 is an apocalyptic number.

21071751902 is a deficient number, since it is larger than the sum of its proper divisors (10564380298).

21071751902 is a wasteful number, since it uses less digits than its factorization.

21071751902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9501450.

The product of its (nonzero) digits is 8820, while the sum is 35.

The spelling of 21071751902 in words is "twenty-one billion, seventy-one million, seven hundred fifty-one thousand, nine hundred two".