21021030332 has 12 divisors (see below), whose sum is σ = 38950732800. Its totient is φ = 9892249536.

The previous prime is 21021030293. The next prime is 21021030367. The reversal of 21021030332 is 23303012012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21021030332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154566332 + ... + 154566467.

It is an arithmetic number, because the mean of its divisors is an integer number (3245894400).

Almost surely, 2^21021030332 is an apocalyptic number.

It is an amenable number.

21021030332 is a deficient number, since it is larger than the sum of its proper divisors (17929702468).

21021030332 is a wasteful number, since it uses less digits than its factorization.

21021030332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309132820 (or 309132818 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21021030332 its reverse (23303012012), we get a palindrome (44324042344).

The spelling of 21021030332 in words is "twenty-one billion, twenty-one million, thirty thousand, three hundred thirty-two".