21202424133 has 16 divisors (see below), whose sum is σ = 31557098496. Its totient is φ = 12551117040.

The previous prime is 21202424081. The next prime is 21202424149. The reversal of 21202424133 is 33142420212.

It is a happy number.

It is not a de Polignac number, because 21202424133 - 2⁶ = 21202424069 is a prime.

It is a super-4 number, since 4×21202424133⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202424183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7469485 + ... + 7472322.

It is an arithmetic number, because the mean of its divisors is an integer number (1972318656).

Almost surely, 2^21202424133 is an apocalyptic number.

It is an amenable number.

21202424133 is a deficient number, since it is larger than the sum of its proper divisors (10354674363).

21202424133 is a wasteful number, since it uses less digits than its factorization.

21202424133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14941864.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21202424133 its reverse (33142420212), we get a palindrome (54344844345).

The spelling of 21202424133 in words is "twenty-one billion, two hundred two million, four hundred twenty-four thousand, one hundred thirty-three".