21270420259 has 8 divisors (see below), whose sum is σ = 23952614400. Its totient is φ = 18712979400.

The previous prime is 21270420221. The next prime is 21270420271. The reversal of 21270420259 is 95202407212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21270420259 - 2⁹ = 21270419747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21270420289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31187959 + ... + 31188640.

It is an arithmetic number, because the mean of its divisors is an integer number (2994076800).

Almost surely, 2^21270420259 is an apocalyptic number.

21270420259 is a deficient number, since it is larger than the sum of its proper divisors (2682194141).

21270420259 is a wasteful number, since it uses less digits than its factorization.

21270420259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62376641.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21270420259 in words is "twenty-one billion, two hundred seventy million, four hundred twenty thousand, two hundred fifty-nine".