21133242236507 has 4 divisors (see below), whose sum is σ = 21133291316736. Its totient is φ = 21133193156280.

The previous prime is 21133242236497. The next prime is 21133242236537. The reversal of 21133242236507 is 70563224233112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133242236507 is a prime.

It is a super-2 number, since 2×21133242236507² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133242236537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23888468 + ... + 24757329.

It is an arithmetic number, because the mean of its divisors is an integer number (5283322829184).

Almost surely, 2^{21133242236507} is an apocalyptic number.

21133242236507 is a deficient number, since it is larger than the sum of its proper divisors (49080229).

21133242236507 is an equidigital number, since it uses as much as digits as its factorization.

21133242236507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49080228.

The product of its (nonzero) digits is 362880, while the sum is 41.

Adding to 21133242236507 its reverse (70563224233112), we get a palindrome (91696466469619).

The spelling of 21133242236507 in words is "twenty-one trillion, one hundred thirty-three billion, two hundred forty-two million, two hundred thirty-six thousand, five hundred seven".