3621706421 has 4 divisors (see below), whose sum is σ = 3624013344. Its totient is φ = 3619399500.

The previous prime is 3621706393. The next prime is 3621706427. The reversal of 3621706421 is 1246071263.

3621706421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3621706421 - 2⁶ = 3621706357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621706427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151105 + ... + 1154246.

It is an arithmetic number, because the mean of its divisors is an integer number (906003336).

Almost surely, 2^3621706421 is an apocalyptic number.

It is an amenable number.

3621706421 is a deficient number, since it is larger than the sum of its proper divisors (2306923).

3621706421 is a wasteful number, since it uses less digits than its factorization.

3621706421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306922.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 3621706421 is about 60180.6149935343. The cubic root of 3621706421 is about 1535.6930342535.

Adding to 3621706421 its reverse (1246071263), we get a palindrome (4867777684).

The spelling of 3621706421 in words is "three billion, six hundred twenty-one million, seven hundred six thousand, four hundred twenty-one".