21236563033 has 32 divisors (see below), whose sum is σ = 25365945600. Its totient is φ = 17394822144.

The previous prime is 21236562973. The next prime is 21236563063. The reversal of 21236563033 is 33036563212.

It is not a de Polignac number, because 21236563033 - 2³³ = 12646628441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21236563033.

It is not an unprimeable number, because it can be changed into a prime (21236563063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11373766 + ... + 11375632.

It is an arithmetic number, because the mean of its divisors is an integer number (792685800).

Almost surely, 2^21236563033 is an apocalyptic number.

It is an amenable number.

21236563033 is a deficient number, since it is larger than the sum of its proper divisors (4129382567).

21236563033 is a wasteful number, since it uses less digits than its factorization.

21236563033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449.

The product of its (nonzero) digits is 58320, while the sum is 34.

The spelling of 21236563033 in words is "twenty-one billion, two hundred thirty-six million, five hundred sixty-three thousand, thirty-three".