21759500852 has 6 divisors (see below), whose sum is σ = 38079126498. Its totient is φ = 10879750424.

The previous prime is 21759500839. The next prime is 21759500899. The reversal of 21759500852 is 25800595712.

It can be written as a sum of positive squares in only one way, i.e., 14707868176 + 7051632676 = 121276^2 + 83974^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2719937603 + ... + 2719937610.

It is an arithmetic number, because the mean of its divisors is an integer number (6346521083).

Almost surely, 2^21759500852 is an apocalyptic number.

It is an amenable number.

21759500852 is a deficient number, since it is larger than the sum of its proper divisors (16319625646).

21759500852 is a wasteful number, since it uses less digits than its factorization.

21759500852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439875217 (or 5439875215 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 44.

The spelling of 21759500852 in words is "twenty-one billion, seven hundred fifty-nine million, five hundred thousand, eight hundred fifty-two".