21869699 has 2 divisors, whose sum is σ = 21869700. Its totient is φ = 21869698.

The previous prime is 21869693. The next prime is 21869713. The reversal of 21869699 is 99696812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21869699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21869693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10934849 + 10934850.

It is an arithmetic number, because the mean of its divisors is an integer number (10934850).

Almost surely, 2^21869699 is an apocalyptic number.

21869699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21869699 is an equidigital number, since it uses as much as digits as its factorization.

21869699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 21869699 is about 4676.5049983936. The cubic root of 21869699 is about 279.6496425711.

The spelling of 21869699 in words is "twenty-one million, eight hundred sixty-nine thousand, six hundred ninety-nine".