20211023125523 has 4 divisors (see below), whose sum is σ = 20280002726928. Its totient is φ = 20142043524120.

The previous prime is 20211023125519. The next prime is 20211023125567. The reversal of 20211023125523 is 32552132011202.

It is a happy number.

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 20211023125523 - 2² = 20211023125519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20219023125523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34489800263 + ... + 34489800848.

It is an arithmetic number, because the mean of its divisors is an integer number (5070000681732).

Almost surely, 2^{20211023125523} is an apocalyptic number.

20211023125523 is a deficient number, since it is larger than the sum of its proper divisors (68979601405).

20211023125523 is an equidigital number, since it uses as much as digits as its factorization.

20211023125523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68979601404.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 20211023125523 its reverse (32552132011202), we get a palindrome (52763155136725).

The spelling of 20211023125523 in words is "twenty trillion, two hundred eleven billion, twenty-three million, one hundred twenty-five thousand, five hundred twenty-three".