25773572421 has 6 divisors (see below), whose sum is σ = 37228493510. Its totient is φ = 17182381608.

The previous prime is 25773572411. The next prime is 25773572431. The reversal of 25773572421 is 12427537752.

25773572421 is a `hidden beast` number, since 2 + 5 + 7 + 73 + 572 + 4 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (25773572411) and next prime (25773572431).

It can be written as a sum of positive squares in only one way, i.e., 25712122500 + 61449921 = 160350^2 + 7839^2 .

It is not a de Polignac number, because 25773572421 - 2¹⁴ = 25773556037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25773572401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1431865126 + ... + 1431865143.

Almost surely, 2^25773572421 is an apocalyptic number.

It is an amenable number.

25773572421 is a deficient number, since it is larger than the sum of its proper divisors (11454921089).

25773572421 is a wasteful number, since it uses less digits than its factorization.

25773572421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863730275 (or 2863730272 counting only the distinct ones).

The product of its digits is 823200, while the sum is 45.

The spelling of 25773572421 in words is "twenty-five billion, seven hundred seventy-three million, five hundred seventy-two thousand, four hundred twenty-one".