21130320402 has 48 divisors (see below), whose sum is σ = 47536145280. Its totient is φ = 6775423200.

The previous prime is 21130320401. The next prime is 21130320433. The reversal of 21130320402 is 20402303112.

21130320402 is a `hidden beast` number, since 211 + 30 + 3 + 20 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21130320401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66777 + ... + 216147.

It is an arithmetic number, because the mean of its divisors is an integer number (990336360).

Almost surely, 2^21130320402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130320402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23768072640).

21130320402 is an abundant number, since it is smaller than the sum of its proper divisors (26405824878).

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

21130320402 is a wasteful number, since it uses less digits than its factorization.

21130320402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149679 (or 149676 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21130320402 its reverse (20402303112), we get a palindrome (41532623514).

The spelling of 21130320402 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, four hundred two".