21452002240 has 112 divisors (see below), whose sum is σ = 51905367360. Its totient is φ = 8443699200.

The previous prime is 21452002141. The next prime is 21452002261. The reversal of 21452002240 is 4220025412.

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, 5264844 + ... + 5268916.

It is an arithmetic number, because the mean of its divisors is an integer number (463440780).

Almost surely, 2^21452002240 is an apocalyptic number.

21452002240 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 21452002240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25952683680).

21452002240 is an abundant number, since it is smaller than the sum of its proper divisors (30453365120).

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

21452002240 is a wasteful number, since it uses less digits than its factorization.

21452002240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350 (or 4340 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 21452002240 its reverse (4220025412), we get a palindrome (25672027652).

The spelling of 21452002240 in words is "twenty-one billion, four hundred fifty-two million, two thousand, two hundred forty".