21528935937 has 6 divisors (see below), whose sum is σ = 31097351922. Its totient is φ = 14352623952.

The previous prime is 21528935917. The next prime is 21528935969. The reversal of 21528935937 is 73953982512.

21528935937 is a `hidden beast` number, since 2 + 1 + 5 + 289 + 359 + 3 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15109080561 + 6419855376 = 122919^2 + 80124^2 .

It is not a de Polignac number, because 21528935937 - 2⁷ = 21528935809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21528935917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1196051988 + ... + 1196052005.

It is an arithmetic number, because the mean of its divisors is an integer number (5182891987).

Almost surely, 2^21528935937 is an apocalyptic number.

It is an amenable number.

21528935937 is a deficient number, since it is larger than the sum of its proper divisors (9568415985).

21528935937 is a wasteful number, since it uses less digits than its factorization.

21528935937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392103999 (or 2392103996 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The spelling of 21528935937 in words is "twenty-one billion, five hundred twenty-eight million, nine hundred thirty-five thousand, nine hundred thirty-seven".