21100234624 has 128 divisors (see below), whose sum is σ = 51394633920. Its totient is φ = 8422686720.

The previous prime is 21100234619. The next prime is 21100234657. The reversal of 21100234624 is 42643200112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470364 + ... + 1484644.

Almost surely, 2^21100234624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100234624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25697316960).

21100234624 is an abundant number, since it is smaller than the sum of its proper divisors (30294399296).

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

21100234624 is a wasteful number, since it uses less digits than its factorization.

21100234624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14416 (or 14404 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21100234624 its reverse (42643200112), we get a palindrome (63743434736).

The spelling of 21100234624 in words is "twenty-one billion, one hundred million, two hundred thirty-four thousand, six hundred twenty-four".