21131987710 has 8 divisors (see below), whose sum is σ = 38037577896. Its totient is φ = 8452795080.

The previous prime is 21131987629. The next prime is 21131987719. The reversal of 21131987710 is 1778913112.

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 (21131987719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056599376 + ... + 1056599395.

It is an arithmetic number, because the mean of its divisors is an integer number (4754697237).

Almost surely, 2^21131987710 is an apocalyptic number.

21131987710 is a deficient number, since it is larger than the sum of its proper divisors (16905590186).

21131987710 is a wasteful number, since it uses less digits than its factorization.

21131987710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113198778.

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 21131987710 in words is "twenty-one billion, one hundred thirty-one million, nine hundred eighty-seven thousand, seven hundred ten".