21452413020 has 144 divisors (see below), whose sum is σ = 62455131648. Its totient is φ = 5501592320.

The previous prime is 21452412997. The next prime is 21452413027. The reversal of 21452413020 is 2031425412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452413027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15692377 + ... + 15693743.

It is an arithmetic number, because the mean of its divisors is an integer number (433716192).

Almost surely, 2^21452413020 is an apocalyptic number.

21452413020 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 21452413020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31227565824).

21452413020 is an abundant number, since it is smaller than the sum of its proper divisors (41002718628).

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

21452413020 is a wasteful number, since it uses less digits than its factorization.

21452413020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748 (or 1717 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21452413020 its reverse (2031425412), we get a palindrome (23483838432).

The spelling of 21452413020 in words is "twenty-one billion, four hundred fifty-two million, four hundred thirteen thousand, twenty".