2605436232021 has 64 divisors (see below), whose sum is σ = 4441406914560. Its totient is φ = 1478681360640.

The previous prime is 2605436232019. The next prime is 2605436232043. The reversal of 2605436232021 is 1202326345062.

2605436232021 is a `hidden beast` number, since 2 + 6 + 0 + 5 + 4 + 3 + 623 + 2 + 0 + 21 = 666.

It is not a de Polignac number, because 2605436232021 - 2¹ = 2605436232019 is a prime.

It is a super-2 number, since 2×2605436232021² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605436232521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38820525 + ... + 38887581.

It is an arithmetic number, because the mean of its divisors is an integer number (69396983040).

Almost surely, 2^{2605436232021} is an apocalyptic number.

2605436232021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2605436232021 is a deficient number, since it is larger than the sum of its proper divisors (1835970682539).

2605436232021 is a wasteful number, since it uses less digits than its factorization.

2605436232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68471 (or 68465 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 2605436232021 in words is "two trillion, six hundred five billion, four hundred thirty-six million, two hundred thirty-two thousand, twenty-one".