21234177534 has 8 divisors (see below), whose sum is σ = 42468355080. Its totient is φ = 7078059176.

The previous prime is 21234177511. The next prime is 21234177571. The reversal of 21234177534 is 43577143212.

It is a sphenic number, since it is the product of 3 distinct primes.

21234177534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21234177492 and 21234177501.

It is a congruent number.

It is an unprimeable number.

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, 1769514789 + ... + 1769514800.

It is an arithmetic number, because the mean of its divisors is an integer number (5308544385).

Almost surely, 2^21234177534 is an apocalyptic number.

21234177534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21234177534 is a wasteful number, since it uses less digits than its factorization.

21234177534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539029594.

The product of its digits is 141120, while the sum is 39.

The spelling of 21234177534 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, five hundred thirty-four".