2605086421 has 18 divisors (see below), whose sum is σ = 3167923542. Its totient is φ = 2135826000.

The previous prime is 2605086397. The next prime is 2605086427. The reversal of 2605086421 is 1246805062.

It can be written as a sum of positive squares in only one way, i.e., 1820302225 + 784784196 = 42665^2 + 28014^2 .

It is not a de Polignac number, because 2605086421 - 2¹⁷ = 2604955349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605086427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24330 + ... + 76171.

Almost surely, 2^2605086421 is an apocalyptic number.

It is an amenable number.

2605086421 is a deficient number, since it is larger than the sum of its proper divisors (562837121).

2605086421 is a wasteful number, since it uses less digits than its factorization.

2605086421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100561 (or 100531 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 2605086421 is about 51040.0472276427. The cubic root of 2605086421 is about 1375.9649726089.

The spelling of 2605086421 in words is "two billion, six hundred five million, eighty-six thousand, four hundred twenty-one".