21861550510 has 16 divisors (see below), whose sum is σ = 39381580800. Its totient is φ = 8737778016.

The previous prime is 21861550463. The next prime is 21861550519. The reversal of 21861550510 is 1505516812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21861550519) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 841845 + ... + 867424.

It is an arithmetic number, because the mean of its divisors is an integer number (2461348800).

Almost surely, 2^21861550510 is an apocalyptic number.

21861550510 is a deficient number, since it is larger than the sum of its proper divisors (17520030290).

21861550510 is a wasteful number, since it uses less digits than its factorization.

21861550510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710555.

The product of its (nonzero) digits is 12000, while the sum is 34.

The spelling of 21861550510 in words is "twenty-one billion, eight hundred sixty-one million, five hundred fifty thousand, five hundred ten".