21429826807 has 2 divisors, whose sum is σ = 21429826808. Its totient is φ = 21429826806.

The previous prime is 21429826793. The next prime is 21429826841. The reversal of 21429826807 is 70862892412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21429826807 - 2³¹ = 19282343159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21429826307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10714913403 + 10714913404.

It is an arithmetic number, because the mean of its divisors is an integer number (10714913404).

Almost surely, 2^21429826807 is an apocalyptic number.

21429826807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21429826807 is an equidigital number, since it uses as much as digits as its factorization.

21429826807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 21429826807 in words is "twenty-one billion, four hundred twenty-nine million, eight hundred twenty-six thousand, eight hundred seven".