3653521421 has 8 divisors (see below), whose sum is σ = 3988579104. Its totient is φ = 3318950320.

The previous prime is 3653521367. The next prime is 3653521423. The reversal of 3653521421 is 1241253563.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3653521421 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 (3653521423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105851 + ... + 136056.

It is an arithmetic number, because the mean of its divisors is an integer number (498572388).

Almost surely, 2^3653521421 is an apocalyptic number.

It is an amenable number.

3653521421 is a deficient number, since it is larger than the sum of its proper divisors (335057683).

3653521421 is a wasteful number, since it uses less digits than its factorization.

3653521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243291.

The product of its digits is 21600, while the sum is 32.

The square root of 3653521421 is about 60444.3663297085. The cubic root of 3653521421 is about 1540.1767128695.

Adding to 3653521421 its reverse (1241253563), we get a palindrome (4894774984).

The spelling of 3653521421 in words is "three billion, six hundred fifty-three million, five hundred twenty-one thousand, four hundred twenty-one".