21405417066202 has 16 divisors (see below), whose sum is σ = 34599339099360. Its totient is φ = 9873321065712.

The previous prime is 21405417066149. The next prime is 21405417066277. The reversal of 21405417066202 is 20266071450412.

It is a happy number.

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, 254215248 + ... + 254299435.

It is an arithmetic number, because the mean of its divisors is an integer number (2162458693710).

Almost surely, 2^{21405417066202} is an apocalyptic number.

21405417066202 is a deficient number, since it is larger than the sum of its proper divisors (13193922033158).

21405417066202 is a wasteful number, since it uses less digits than its factorization.

21405417066202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508516317.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 21405417066202 in words is "twenty-one trillion, four hundred five billion, four hundred seventeen million, sixty-six thousand, two hundred two".