21636850384 has 10 divisors (see below), whose sum is σ = 41921397650. Its totient is φ = 10818425184.

The previous prime is 21636850373. The next prime is 21636850387. The reversal of 21636850384 is 48305863612.

It can be written as a sum of positive squares in only one way, i.e., 21529105984 + 107744400 = 146728^2 + 10380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21636850387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676151559 + ... + 676151590.

It is an arithmetic number, because the mean of its divisors is an integer number (4192139765).

Almost surely, 2^21636850384 is an apocalyptic number.

It is an amenable number.

21636850384 is a deficient number, since it is larger than the sum of its proper divisors (20284547266).

21636850384 is a wasteful number, since it uses less digits than its factorization.

21636850384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352303157 (or 1352303151 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 21636850384 in words is "twenty-one billion, six hundred thirty-six million, eight hundred fifty thousand, three hundred eighty-four".