21010533402512 has 10 divisors (see below), whose sum is σ = 40707908467398. Its totient is φ = 10505266701248.

The previous prime is 21010533402457. The next prime is 21010533402517. The reversal of 21010533402512 is 21520433501012.

It can be written as a sum of positive squares in only one way, i.e., 20543229911296 + 467303491216 = 4532464^2 + 683596^2 .

It is not an unprimeable number, because it can be changed into a prime (21010533402517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656579168813 + ... + 656579168844.

Almost surely, 2^{21010533402512} is an apocalyptic number.

It is an amenable number.

21010533402512 is a deficient number, since it is larger than the sum of its proper divisors (19697375064886).

21010533402512 is a wasteful number, since it uses less digits than its factorization.

21010533402512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313158337665 (or 1313158337659 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21010533402512 its reverse (21520433501012), we get a palindrome (42530966903524).

The spelling of 21010533402512 in words is "twenty-one trillion, ten billion, five hundred thirty-three million, four hundred two thousand, five hundred twelve".