21405452614474 has 4 divisors (see below), whose sum is σ = 32108178921714. Its totient is φ = 10702726307236.

The previous prime is 21405452614451. The next prime is 21405452614489. The reversal of 21405452614474 is 47441625450412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20367484911225 + 1037967703249 = 4513035^2 + 1018807^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5351363153617 + ... + 5351363153620.

Almost surely, 2^{21405452614474} is an apocalyptic number.

21405452614474 is a deficient number, since it is larger than the sum of its proper divisors (10702726307240).

21405452614474 is a wasteful number, since it uses less digits than its factorization.

21405452614474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10702726307239.

The product of its (nonzero) digits is 4300800, while the sum is 49.

The spelling of 21405452614474 in words is "twenty-one trillion, four hundred five billion, four hundred fifty-two million, six hundred fourteen thousand, four hundred seventy-four".