3657522021 has 16 divisors (see below), whose sum is σ = 5310379200. Its totient is φ = 2230357248.

The previous prime is 3657522019. The next prime is 3657522023. The reversal of 3657522021 is 1202257563.

It is an interprime number because it is at equal distance from previous prime (3657522019) and next prime (3657522023).

It is not a de Polignac number, because 3657522021 - 2¹ = 3657522019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3657522023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1104676 + ... + 1107981.

It is an arithmetic number, because the mean of its divisors is an integer number (331898700).

Almost surely, 2^3657522021 is an apocalyptic number.

It is an amenable number.

3657522021 is a deficient number, since it is larger than the sum of its proper divisors (1652857179).

3657522021 is a wasteful number, since it uses less digits than its factorization.

3657522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212708.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 3657522021 is about 60477.4505167009. The cubic root of 3657522021 is about 1540.7386714680.

Adding to 3657522021 its reverse (1202257563), we get a palindrome (4859779584).

The spelling of 3657522021 in words is "three billion, six hundred fifty-seven million, five hundred twenty-two thousand, twenty-one".