21041233247 has 2 divisors, whose sum is σ = 21041233248. Its totient is φ = 21041233246.

The previous prime is 21041233237. The next prime is 21041233259. The reversal of 21041233247 is 74233214012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041233247 - 2²⁶ = 20974124383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041233237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520616623 + 10520616624.

It is an arithmetic number, because the mean of its divisors is an integer number (10520616624).

Almost surely, 2^21041233247 is an apocalyptic number.

21041233247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041233247 is an equidigital number, since it uses as much as digits as its factorization.

21041233247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 21041233247 its reverse (74233214012), we get a palindrome (95274447259).

The spelling of 21041233247 in words is "twenty-one billion, forty-one million, two hundred thirty-three thousand, two hundred forty-seven".