2635573021 has 4 divisors (see below), whose sum is σ = 2659752700. Its totient is φ = 2611393344.

The previous prime is 2635573009. The next prime is 2635573043. The reversal of 2635573021 is 1203755362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1203755362 = 2 ⋅601877681.

It can be written as a sum of positive squares in 2 ways, for example, as 753228025 + 1882344996 = 27445^2 + 43386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2635573021 - 2¹⁵ = 2635540253 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 (2635573051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12089676 + ... + 12089893.

It is an arithmetic number, because the mean of its divisors is an integer number (664938175).

Almost surely, 2^2635573021 is an apocalyptic number.

It is an amenable number.

2635573021 is a deficient number, since it is larger than the sum of its proper divisors (24179679).

2635573021 is a wasteful number, since it uses less digits than its factorization.

2635573021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24179678.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 2635573021 is about 51337.8322584817. The cubic root of 2635573021 is about 1381.3116809921.

The spelling of 2635573021 in words is "two billion, six hundred thirty-five million, five hundred seventy-three thousand, twenty-one".