21024133331 has 4 divisors (see below), whose sum is σ = 21054125664. Its totient is φ = 20994141000.

The previous prime is 21024133309. The next prime is 21024133367. The reversal of 21024133331 is 13333142012.

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

It is a cyclic number.

It is not a de Polignac number, because 21024133331 - 2⁶ = 21024133267 is a prime.

It is a super-2 number, since 2×21024133331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21024133297 and 21024133306.

It is not an unprimeable number, because it can be changed into a prime (21024130331) 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, 14995115 + ... + 14996516.

It is an arithmetic number, because the mean of its divisors is an integer number (5263531416).

Almost surely, 2^21024133331 is an apocalyptic number.

21024133331 is a deficient number, since it is larger than the sum of its proper divisors (29992333).

21024133331 is an equidigital number, since it uses as much as digits as its factorization.

21024133331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29992332.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21024133331 its reverse (13333142012), we get a palindrome (34357275343).

The spelling of 21024133331 in words is "twenty-one billion, twenty-four million, one hundred thirty-three thousand, three hundred thirty-one".