21003355552 has 24 divisors (see below), whose sum is σ = 41354032356. Its totient is φ = 10500744192.

The previous prime is 21003355537. The next prime is 21003355561. The reversal of 21003355552 is 25555330012.

It can be written as a sum of positive squares in 2 ways, for example, as 20954299536 + 49056016 = 144756^2 + 7004^2 .

It is a super-2 number, since 2×21003355552² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 465378 + ... + 508510.

Almost surely, 2^21003355552 is an apocalyptic number.

It is an amenable number.

21003355552 is a deficient number, since it is larger than the sum of its proper divisors (20350676804).

21003355552 is a wasteful number, since it uses less digits than its factorization.

21003355552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58360 (or 58352 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 31.

Adding to 21003355552 its reverse (25555330012), we get a palindrome (46558685564).

The spelling of 21003355552 in words is "twenty-one billion, three million, three hundred fifty-five thousand, five hundred fifty-two".