2693409427921 has 3 divisors (see below), whose sum is σ = 2693411069083. Its totient is φ = 2693407786760.

The previous prime is 2693409427909. The next prime is 2693409427939. The reversal of 2693409427921 is 1297249043962.

The square root of 2693409427921 is 1641161.

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 can be written as a sum of positive squares in only one way, i.e., 8530554321 + 2684878873600 = 92361^2 + 1638560^2 .

It is not a de Polignac number, because 2693409427921 - 2⁹ = 2693409427409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2693409427421) 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, 820581 + ... + 2461741.

Almost surely, 2^{2693409427921} is an apocalyptic number.

2693409427921 is the 1641161-st square number.

2693409427921 is the 820581-st centered octagonal number.

It is an amenable number.

2693409427921 is a deficient number, since it is larger than the sum of its proper divisors (1641162).

2693409427921 is an frugal number, since it uses more digits than its factorization.

2693409427921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282322 (or 1641161 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 2693409427921 in words is "two trillion, six hundred ninety-three billion, four hundred nine million, four hundred twenty-seven thousand, nine hundred twenty-one".