21052671245761 has 3 divisors (see below), whose sum is σ = 21052675834081. Its totient is φ = 21052666657442.

The previous prime is 21052671245759. The next prime is 21052671245777. The reversal of 21052671245761 is 16754217625012.

The square root of 21052671245761 is 4588319.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 21052671245761 - 2¹ = 21052671245759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052671245701) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2294160 + ... + 6882478.

Almost surely, 2^{21052671245761} is an apocalyptic number.

21052671245761 is the 4588319-th square number.

21052671245761 is the 2294160-th centered octagonal number.

It is an amenable number.

21052671245761 is a deficient number, since it is larger than the sum of its proper divisors (4588320).

21052671245761 is an frugal number, since it uses more digits than its factorization.

21052671245761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9176638 (or 4588319 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 21052671245761 in words is "twenty-one trillion, fifty-two billion, six hundred seventy-one million, two hundred forty-five thousand, seven hundred sixty-one".