55821023 has 4 divisors (see below), whose sum is σ = 58248048. Its totient is φ = 53394000.

The previous prime is 55821011. The next prime is 55821043. The reversal of 55821023 is 32012855.

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

It is a cyclic number.

It is not a de Polignac number, because 55821023 - 2⁶ = 55820959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55820983 and 55821001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55821043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213478 + ... + 1213523.

It is an arithmetic number, because the mean of its divisors is an integer number (14562012).

Almost surely, 2^55821023 is an apocalyptic number.

55821023 is a deficient number, since it is larger than the sum of its proper divisors (2427025).

55821023 is a wasteful number, since it uses less digits than its factorization.

55821023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427024.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 55821023 is about 7471.3467996071. The cubic root of 55821023 is about 382.1782174185.

Adding to 55821023 its reverse (32012855), we get a palindrome (87833878).

The spelling of 55821023 in words is "fifty-five million, eight hundred twenty-one thousand, twenty-three".