21133030487 has 2 divisors, whose sum is σ = 21133030488. Its totient is φ = 21133030486.

The previous prime is 21133030441. The next prime is 21133030543. The reversal of 21133030487 is 78403033112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133030487 - 2²⁴ = 21116253271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133030427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566515243 + 10566515244.

It is an arithmetic number, because the mean of its divisors is an integer number (10566515244).

Almost surely, 2^21133030487 is an apocalyptic number.

21133030487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133030487 is an equidigital number, since it uses as much as digits as its factorization.

21133030487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 21133030487 its reverse (78403033112), we get a palindrome (99536063599).

The spelling of 21133030487 in words is "twenty-one billion, one hundred thirty-three million, thirty thousand, four hundred eighty-seven".