21434879 has 2 divisors, whose sum is σ = 21434880. Its totient is φ = 21434878.

The previous prime is 21434839. The next prime is 21434891. The reversal of 21434879 is 97843412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434879 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 21434879 parts by 6547 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717439 + 10717440.

It is an arithmetic number, because the mean of its divisors is an integer number (10717440).

Almost surely, 2^21434879 is an apocalyptic number.

21434879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434879 is an equidigital number, since it uses as much as digits as its factorization.

21434879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 21434879 is about 4629.7817443158. The cubic root of 21434879 is about 277.7838623319.

The spelling of 21434879 in words is "twenty-one million, four hundred thirty-four thousand, eight hundred seventy-nine".