9914215621 has 4 divisors (see below), whose sum is σ = 9964036000. Its totient is φ = 9864395244.

The previous prime is 9914215543. The next prime is 9914215681. The reversal of 9914215621 is 1265124199.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1265124199 = 43 ⋅29421493.

It is a cyclic number.

It is not a de Polignac number, because 9914215621 - 2²⁹ = 9377344709 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 (9914215681) 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, 24909891 + ... + 24910288.

It is an arithmetic number, because the mean of its divisors is an integer number (2491009000).

Almost surely, 2^9914215621 is an apocalyptic number.

It is an amenable number.

9914215621 is a deficient number, since it is larger than the sum of its proper divisors (49820379).

9914215621 is a wasteful number, since it uses less digits than its factorization.

9914215621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49820378.

The product of its digits is 38880, while the sum is 40.

The square root of 9914215621 is about 99570.1542682344. The cubic root of 9914215621 is about 2148.2564281973.

The spelling of 9914215621 in words is "nine billion, nine hundred fourteen million, two hundred fifteen thousand, six hundred twenty-one".