21006131330 has 32 divisors (see below), whose sum is σ = 37901799936. Its totient is φ = 8382314304.

The previous prime is 21006131329. The next prime is 21006131339. The reversal of 21006131330 is 3313160012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21006131339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12831272 + ... + 12832908.

It is an arithmetic number, because the mean of its divisors is an integer number (1184431248).

Almost surely, 2^21006131330 is an apocalyptic number.

21006131330 is a deficient number, since it is larger than the sum of its proper divisors (16895668606).

21006131330 is a wasteful number, since it uses less digits than its factorization.

21006131330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21006131330 its reverse (3313160012), we get a palindrome (24319291342).

The spelling of 21006131330 in words is "twenty-one billion, six million, one hundred thirty-one thousand, three hundred thirty".