21870326650 has 24 divisors (see below), whose sum is σ = 40685788800. Its totient is φ = 8746629360.

The previous prime is 21870326591. The next prime is 21870326663. The reversal of 21870326650 is 5662307812.

It is a super-2 number, since 2×21870326650² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 284001 + ... + 352699.

It is an arithmetic number, because the mean of its divisors is an integer number (1695241200).

Almost surely, 2^21870326650 is an apocalyptic number.

21870326650 is a deficient number, since it is larger than the sum of its proper divisors (18815462150).

21870326650 is a wasteful number, since it uses less digits than its factorization.

21870326650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75078 (or 75073 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21870326650 in words is "twenty-one billion, eight hundred seventy million, three hundred twenty-six thousand, six hundred fifty".