21810123757434 has 16 divisors (see below), whose sum is σ = 44234617199040. Its totient is φ = 7167646305120.

The previous prime is 21810123757417. The next prime is 21810123757489. The reversal of 21810123757434 is 43475732101812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25598736379 + ... + 25598737230.

It is an arithmetic number, because the mean of its divisors is an integer number (2764663574940).

Almost surely, 2^{21810123757434} is an apocalyptic number.

21810123757434 is an abundant number, since it is smaller than the sum of its proper divisors (22424493441606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21810123757434 is a wasteful number, since it uses less digits than its factorization.

21810123757434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51197473685.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 21810123757434 in words is "twenty-one trillion, eight hundred ten billion, one hundred twenty-three million, seven hundred fifty-seven thousand, four hundred thirty-four".