21469807 has 2 divisors, whose sum is σ = 21469808. Its totient is φ = 21469806.

The previous prime is 21469783. The next prime is 21469843. The reversal of 21469807 is 70896412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21469807 is a prime.

It is a super-2 number, since 2×21469807² = 921905225234498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21469897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734903 + 10734904.

It is an arithmetic number, because the mean of its divisors is an integer number (10734904).

Almost surely, 2^21469807 is an apocalyptic number.

21469807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469807 is an equidigital number, since it uses as much as digits as its factorization.

21469807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21469807 is about 4633.5523089742. The cubic root of 21469807 is about 277.9346628020.

The spelling of 21469807 in words is "twenty-one million, four hundred sixty-nine thousand, eight hundred seven".