21435140805828 has 24 divisors (see below), whose sum is σ = 50457942077088. Its totient is φ = 7081816430976.

The previous prime is 21435140805769. The next prime is 21435140805857. The reversal of 21435140805828 is 82850804153412.

It is a happy number.

It is a super-2 number, since 2×21435140805828² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7903811626 + ... + 7903814337.

It is an arithmetic number, because the mean of its divisors is an integer number (2102414253212).

Almost surely, 2^{21435140805828} is an apocalyptic number.

It is an amenable number.

21435140805828 is an abundant number, since it is smaller than the sum of its proper divisors (29022801271260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21435140805828 is a wasteful number, since it uses less digits than its factorization.

21435140805828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15807626083 (or 15807626081 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 51.

The spelling of 21435140805828 in words is "twenty-one trillion, four hundred thirty-five billion, one hundred forty million, eight hundred five thousand, eight hundred twenty-eight".