21024501330 has 64 divisors (see below), whose sum is σ = 57795897600. Its totient is φ = 4794875904.

The previous prime is 21024501283. The next prime is 21024501331. The reversal of 21024501330 is 3310542012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21024501297 and 21024501306.

It is not an unprimeable number, because it can be changed into a prime (21024501331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17199 + ... + 205778.

It is an arithmetic number, because the mean of its divisors is an integer number (903060900).

Almost surely, 2^21024501330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21024501330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28897948800).

21024501330 is an abundant number, since it is smaller than the sum of its proper divisors (36771396270).

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

21024501330 is a wasteful number, since it uses less digits than its factorization.

21024501330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223443.

The product of its (nonzero) digits is 720, while the sum is 21.

The spelling of 21024501330 in words is "twenty-one billion, twenty-four million, five hundred one thousand, three hundred thirty".