21577532852 has 6 divisors (see below), whose sum is σ = 37760682498. Its totient is φ = 10788766424.

The previous prime is 21577532803. The next prime is 21577532881. The reversal of 21577532852 is 25823577512.

It can be written as a sum of positive squares in only one way, i.e., 12013475236 + 9564057616 = 109606^2 + 97796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21577532797 and 21577532806.

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, 2697191603 + ... + 2697191610.

It is an arithmetic number, because the mean of its divisors is an integer number (6293447083).

Almost surely, 2^21577532852 is an apocalyptic number.

It is an amenable number.

21577532852 is a deficient number, since it is larger than the sum of its proper divisors (16183149646).

21577532852 is a wasteful number, since it uses less digits than its factorization.

21577532852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5394383217 (or 5394383215 counting only the distinct ones).

The product of its digits is 1176000, while the sum is 47.

The spelling of 21577532852 in words is "twenty-one billion, five hundred seventy-seven million, five hundred thirty-two thousand, eight hundred fifty-two".