4350121621 has 4 divisors (see below), whose sum is σ = 4381417600. Its totient is φ = 4318825644.

The previous prime is 4350121591. The next prime is 4350121639. The reversal of 4350121621 is 1261210534.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-4350121621 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 (4350121661) 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, 15647781 + ... + 15648058.

It is an arithmetic number, because the mean of its divisors is an integer number (1095354400).

Almost surely, 2^4350121621 is an apocalyptic number.

It is an amenable number.

4350121621 is a deficient number, since it is larger than the sum of its proper divisors (31295979).

4350121621 is a wasteful number, since it uses less digits than its factorization.

4350121621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31295978.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 4350121621 is about 65955.4517913417. The cubic root of 4350121621 is about 1632.4271143412.

The spelling of 4350121621 in words is "four billion, three hundred fifty million, one hundred twenty-one thousand, six hundred twenty-one".