21402530532 has 120 divisors (see below), whose sum is σ = 57461564160. Its totient is φ = 6944071680.

The previous prime is 21402530531. The next prime is 21402530533. The reversal of 21402530532 is 23503520412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21402530531) and next prime (21402530533).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21402530496 and 21402530505.

It is not an unprimeable number, because it can be changed into a prime (21402530531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1811428 + ... + 1823204.

It is an arithmetic number, because the mean of its divisors is an integer number (478846368).

Almost surely, 2^21402530532 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 21402530532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28730782080).

21402530532 is an abundant number, since it is smaller than the sum of its proper divisors (36059033628).

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

21402530532 is a wasteful number, since it uses less digits than its factorization.

21402530532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11943 (or 11932 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21402530532 in words is "twenty-one billion, four hundred two million, five hundred thirty thousand, five hundred thirty-two".