21124542210 has 128 divisors (see below), whose sum is σ = 55627015680. Its totient is φ = 5110296576.

The previous prime is 21124542191. The next prime is 21124542221. The reversal of 21124542210 is 1224542112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14537844 + ... + 14539296.

It is an arithmetic number, because the mean of its divisors is an integer number (434586060).

Almost surely, 2^21124542210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21124542210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27813507840).

21124542210 is an abundant number, since it is smaller than the sum of its proper divisors (34502473470).

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

21124542210 is a wasteful number, since it uses less digits than its factorization.

21124542210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492.

The product of its (nonzero) digits is 1280, while the sum is 24.

The spelling of 21124542210 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-two thousand, two hundred ten".