21235124760 has 128 divisors (see below), whose sum is σ = 65220154560. Its totient is φ = 5529600000.

The previous prime is 21235124731. The next prime is 21235124821. The reversal of 21235124760 is 6742153212.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

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, 872760 + ... + 896760.

Almost surely, 2^21235124760 is an apocalyptic number.

21235124760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21235124760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32610077280).

21235124760 is an abundant number, since it is smaller than the sum of its proper divisors (43985029800).

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

21235124760 is a wasteful number, since it uses less digits than its factorization.

21235124760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24189 (or 24185 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 21235124760 its reverse (6742153212), we get a palindrome (27977277972).

The spelling of 21235124760 in words is "twenty-one billion, two hundred thirty-five million, one hundred twenty-four thousand, seven hundred sixty".