21030215852 has 12 divisors (see below), whose sum is σ = 36807266496. Its totient is φ = 10513854000.

The previous prime is 21030215849. The next prime is 21030215867. The reversal of 21030215852 is 25851203012.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 275228 + ... + 343235.

It is an arithmetic number, because the mean of its divisors is an integer number (3067272208).

Almost surely, 2^21030215852 is an apocalyptic number.

It is an amenable number.

21030215852 is a deficient number, since it is larger than the sum of its proper divisors (15777050644).

21030215852 is a wasteful number, since it uses less digits than its factorization.

21030215852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626968 (or 626966 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 21030215852 its reverse (25851203012), we get a palindrome (46881418864).

The spelling of 21030215852 in words is "twenty-one billion, thirty million, two hundred fifteen thousand, eight hundred fifty-two".