21423436616266 has 8 divisors (see below), whose sum is σ = 34025458155300. Its totient is φ = 10081617231168.

The previous prime is 21423436616233. The next prime is 21423436616273. The reversal of 21423436616266 is 66261663432412.

It can be written as a sum of positive squares in 2 ways, for example, as 19205210640625 + 2218225975641 = 4382375^2 + 1489371^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315050538441 + ... + 315050538508.

Almost surely, 2^{21423436616266} is an apocalyptic number.

21423436616266 is a deficient number, since it is larger than the sum of its proper divisors (12602021539034).

21423436616266 is a wasteful number, since it uses less digits than its factorization.

21423436616266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630101076968.

The product of its digits is 8957952, while the sum is 52.

The spelling of 21423436616266 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred thirty-six million, six hundred sixteen thousand, two hundred sixty-six".