21538760033 has 8 divisors (see below), whose sum is σ = 24621284352. Its totient is φ = 18457625376.

The previous prime is 21538759987. The next prime is 21538760059. The reversal of 21538760033 is 33006783512.

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 21538760033 - 2¹⁴ = 21538743649 is a prime.

It is a super-2 number, since 2×21538760033² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21538760063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313985 + ... + 376382.

It is an arithmetic number, because the mean of its divisors is an integer number (3077660544).

Almost surely, 2^21538760033 is an apocalyptic number.

It is an amenable number.

21538760033 is a deficient number, since it is larger than the sum of its proper divisors (3082524319).

21538760033 is an equidigital number, since it uses as much as digits as its factorization.

21538760033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694831.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21538760033 in words is "twenty-one billion, five hundred thirty-eight million, seven hundred sixty thousand, thirty-three".