99417421 has 2 divisors, whose sum is σ = 99417422. Its totient is φ = 99417420.

The previous prime is 99417413. The next prime is 99417427. The reversal of 99417421 is 12471499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 27405225 = 8486^2 + 5235^2 .

It is an emirp because it is prime and its reverse (12471499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99417421 - 2³ = 99417413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99417427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49708710 + 49708711.

It is an arithmetic number, because the mean of its divisors is an integer number (49708711).

Almost surely, 2^99417421 is an apocalyptic number.

It is an amenable number.

99417421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99417421 is an equidigital number, since it uses as much as digits as its factorization.

99417421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 99417421 is about 9970.8285011828. The cubic root of 99417421 is about 463.2557632277.

The spelling of 99417421 in words is "ninety-nine million, four hundred seventeen thousand, four hundred twenty-one".