21054034459 has 2 divisors, whose sum is σ = 21054034460. Its totient is φ = 21054034458.

The previous prime is 21054034427. The next prime is 21054034531. The reversal of 21054034459 is 95443045012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21054034459 - 2⁵ = 21054034427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21054034259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527017229 + 10527017230.

It is an arithmetic number, because the mean of its divisors is an integer number (10527017230).

Almost surely, 2^21054034459 is an apocalyptic number.

21054034459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054034459 is an equidigital number, since it uses as much as digits as its factorization.

21054034459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21054034459 in words is "twenty-one billion, fifty-four million, thirty-four thousand, four hundred fifty-nine".