21258055427 has 8 divisors (see below), whose sum is σ = 24320421216. Its totient is φ = 18202064832.

The previous prime is 21258055393. The next prime is 21258055457. The reversal of 21258055427 is 72455085212.

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

It is not a de Polignac number, because 21258055427 - 2²⁰ = 21257006851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21258055457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586648 + ... + 1599989.

It is an arithmetic number, because the mean of its divisors is an integer number (3040052652).

Almost surely, 2^21258055427 is an apocalyptic number.

21258055427 is a deficient number, since it is larger than the sum of its proper divisors (3062365789).

21258055427 is an equidigital number, since it uses as much as digits as its factorization.

21258055427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187597.

The product of its (nonzero) digits is 224000, while the sum is 41.

The spelling of 21258055427 in words is "twenty-one billion, two hundred fifty-eight million, fifty-five thousand, four hundred twenty-seven".