21053400002 has 8 divisors (see below), whose sum is σ = 31582609212. Its totient is φ = 10525863600.

The previous prime is 21053399993. The next prime is 21053400023. The reversal of 21053400002 is 20000435012.

It can be written as a sum of positive squares in 2 ways, for example, as 20914655161 + 138744841 = 144619^2 + 11779^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21053400002³ (a number of 32 digits) contains 333 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, 386249 + ... + 437372.

Almost surely, 2^21053400002 is an apocalyptic number.

21053400002 is a deficient number, since it is larger than the sum of its proper divisors (10529209210).

21053400002 is a wasteful number, since it uses less digits than its factorization.

21053400002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836404.

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 21053400002 its reverse (20000435012), we get a palindrome (41053835014).

The spelling of 21053400002 in words is "twenty-one billion, fifty-three million, four hundred thousand, two".