9621421 has 4 divisors (see below), whose sum is σ = 9636192. Its totient is φ = 9606652.

The previous prime is 9621413. The next prime is 9621433. The reversal of 9621421 is 1241269.

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 9621421 - 2³ = 9621413 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 (9621481) 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, 6361 + ... + 7726.

It is an arithmetic number, because the mean of its divisors is an integer number (2409048).

Almost surely, 2^9621421 is an apocalyptic number.

It is an amenable number.

9621421 is a deficient number, since it is larger than the sum of its proper divisors (14771).

9621421 is a wasteful number, since it uses less digits than its factorization.

9621421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14770.

The product of its digits is 864, while the sum is 25.

The square root of 9621421 is about 3101.8415497894. The cubic root of 9621421 is about 212.6896742479.

The spelling of 9621421 in words is "nine million, six hundred twenty-one thousand, four hundred twenty-one".