21699884539 has 2 divisors, whose sum is σ = 21699884540. Its totient is φ = 21699884538.

The previous prime is 21699884533. The next prime is 21699884603. The reversal of 21699884539 is 93548899612.

It is an a-pointer prime, because the next prime (21699884603) can be obtained adding 21699884539 to its sum of digits (64).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21699884539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21699884533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10849942269 + 10849942270.

It is an arithmetic number, because the mean of its divisors is an integer number (10849942270).

Almost surely, 2^21699884539 is an apocalyptic number.

21699884539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21699884539 is an equidigital number, since it uses as much as digits as its factorization.

21699884539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33592320, while the sum is 64.

The spelling of 21699884539 in words is "twenty-one billion, six hundred ninety-nine million, eight hundred eighty-four thousand, five hundred thirty-nine".