21262410055 has 4 divisors (see below), whose sum is σ = 25514892072. Its totient is φ = 17009928040.

The previous prime is 21262410023. The next prime is 21262410061. The reversal of 21262410055 is 55001426212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21262410055 - 2⁵ = 21262410023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2126241001 + ... + 2126241010.

It is an arithmetic number, because the mean of its divisors is an integer number (6378723018).

Almost surely, 2^21262410055 is an apocalyptic number.

21262410055 is a deficient number, since it is larger than the sum of its proper divisors (4252482017).

21262410055 is an equidigital number, since it uses as much as digits as its factorization.

21262410055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252482016.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21262410055 its reverse (55001426212), we get a palindrome (76263836267).

The spelling of 21262410055 in words is "twenty-one billion, two hundred sixty-two million, four hundred ten thousand, fifty-five".