21234177750 has 64 divisors (see below), whose sum is σ = 53418074112. Its totient is φ = 5617836000.

The previous prime is 21234177749. The next prime is 21234177779. The reversal of 21234177750 is 5777143212.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21234177699 and 21234177708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16216 + ... + 206715.

It is an arithmetic number, because the mean of its divisors is an integer number (834657408).

Almost surely, 2^21234177750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21234177750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26709037056).

21234177750 is an abundant number, since it is smaller than the sum of its proper divisors (32183896362).

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

21234177750 is a wasteful number, since it uses less digits than its factorization.

21234177750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223078 (or 223068 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 39.

The spelling of 21234177750 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, seven hundred fifty".