21133992247 has 2 divisors, whose sum is σ = 21133992248. Its totient is φ = 21133992246.

The previous prime is 21133992197. The next prime is 21133992259. The reversal of 21133992247 is 74229933112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133992247 is a prime.

It is a super-2 number, since 2×21133992247² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133990247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566996123 + 10566996124.

It is an arithmetic number, because the mean of its divisors is an integer number (10566996124).

Almost surely, 2^21133992247 is an apocalyptic number.

21133992247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133992247 is an equidigital number, since it uses as much as digits as its factorization.

21133992247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The spelling of 21133992247 in words is "twenty-one billion, one hundred thirty-three million, nine hundred ninety-two thousand, two hundred forty-seven".