21533095937 has 8 divisors (see below), whose sum is σ = 21943512360. Its totient is φ = 21122832640.

The previous prime is 21533095933. The next prime is 21533095967. The reversal of 21533095937 is 73959033512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9979210816 + 11553885121 = 99896^2 + 107489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21533095937 - 2² = 21533095933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21533095891 and 21533095900.

It is not an unprimeable number, because it can be changed into a prime (21533095931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268889 + ... + 339657.

It is an arithmetic number, because the mean of its divisors is an integer number (2742939045).

Almost surely, 2^21533095937 is an apocalyptic number.

It is an amenable number.

21533095937 is a deficient number, since it is larger than the sum of its proper divisors (410416423).

21533095937 is an equidigital number, since it uses as much as digits as its factorization.

21533095937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76563.

The product of its (nonzero) digits is 765450, while the sum is 47.

The spelling of 21533095937 in words is "twenty-one billion, five hundred thirty-three million, ninety-five thousand, nine hundred thirty-seven".