21021001330 has 64 divisors (see below), whose sum is σ = 45881448192. Its totient is φ = 6769244160.

The previous prime is 21021001321. The next prime is 21021001357. The reversal of 21021001330 is 3310012012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021001330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566302 + ... + 602278.

It is an arithmetic number, because the mean of its divisors is an integer number (716897628).

Almost surely, 2^21021001330 is an apocalyptic number.

21021001330 is an abundant number, since it is smaller than the sum of its proper divisors (24860446862).

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

21021001330 is a wasteful number, since it uses less digits than its factorization.

21021001330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36499.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21021001330 its reverse (3310012012), we get a palindrome (24331013342).

The spelling of 21021001330 in words is "twenty-one billion, twenty-one million, one thousand, three hundred thirty".