21554848223 has 4 divisors (see below), whose sum is σ = 21594691368. Its totient is φ = 21515005080.

The previous prime is 21554848193. The next prime is 21554848253. The reversal of 21554848223 is 32284845512.

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

It is an interprime number because it is at equal distance from previous prime (21554848193) and next prime (21554848253).

It is a cyclic number.

It is not a de Polignac number, because 21554848223 - 2²⁴ = 21538071007 is a prime.

It is a super-2 number, since 2×21554848223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554848253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19920761 + ... + 19921842.

It is an arithmetic number, because the mean of its divisors is an integer number (5398672842).

Almost surely, 2^21554848223 is an apocalyptic number.

21554848223 is a deficient number, since it is larger than the sum of its proper divisors (39843145).

21554848223 is an equidigital number, since it uses as much as digits as its factorization.

21554848223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39843144.

The product of its digits is 614400, while the sum is 44.

The spelling of 21554848223 in words is "twenty-one billion, five hundred fifty-four million, eight hundred forty-eight thousand, two hundred twenty-three".