3654120563021 has 24 divisors (see below), whose sum is σ = 3980327203944. Its totient is φ = 3351966801920.

The previous prime is 3654120562949. The next prime is 3654120563059. The reversal of 3654120563021 is 1203650214563.

3654120563021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 2856823365796 + 797297197225 = 1690214^2 + 892915^2 .

It is not a de Polignac number, because 3654120563021 - 2¹⁸ = 3654120300877 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 (3654120563321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11850821 + ... + 12155253.

It is an arithmetic number, because the mean of its divisors is an integer number (165846966831).

Almost surely, 2^{3654120563021} is an apocalyptic number.

It is an amenable number.

3654120563021 is a deficient number, since it is larger than the sum of its proper divisors (326206640923).

3654120563021 is a wasteful number, since it uses less digits than its factorization.

3654120563021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305521 (or 305504 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 3654120563021 its reverse (1203650214563), we get a palindrome (4857770777584).

The spelling of 3654120563021 in words is "three trillion, six hundred fifty-four billion, one hundred twenty million, five hundred sixty-three thousand, twenty-one".