21357260633 has 8 divisors (see below), whose sum is σ = 22616087400. Its totient is φ = 20098713600.

The previous prime is 21357260591. The next prime is 21357260641. The reversal of 21357260633 is 33606275312.

It can be written as a sum of positive squares in 4 ways, for example, as 820077769 + 20537182864 = 28637^2 + 143308^2 .

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 21357260633 - 2³² = 17062293337 is a prime.

It is a super-2 number, since 2×21357260633² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21357260693) 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, 98933 + ... + 229133.

It is an arithmetic number, because the mean of its divisors is an integer number (2827010925).

Almost surely, 2^21357260633 is an apocalyptic number.

It is an amenable number.

21357260633 is a deficient number, since it is larger than the sum of its proper divisors (1258826767).

21357260633 is a wasteful number, since it uses less digits than its factorization.

21357260633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139867.

The product of its (nonzero) digits is 136080, while the sum is 38.

The spelling of 21357260633 in words is "twenty-one billion, three hundred fifty-seven million, two hundred sixty thousand, six hundred thirty-three".