9912421 has 2 divisors, whose sum is σ = 9912422. Its totient is φ = 9912420.

The previous prime is 9912407. The next prime is 9912481. The reversal of 9912421 is 1242199.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 1144900 = 2961^2 + 1070^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912421 - 2¹⁷ = 9781349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9912421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9912401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956210 + 4956211.

It is an arithmetic number, because the mean of its divisors is an integer number (4956211).

Almost surely, 2^9912421 is an apocalyptic number.

It is an amenable number.

9912421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912421 is an equidigital number, since it uses as much as digits as its factorization.

9912421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 9912421 is about 3148.3997522551. The cubic root of 9912421 is about 214.8126798216.

The spelling of 9912421 in words is "nine million, nine hundred twelve thousand, four hundred twenty-one".