97213421 has 2 divisors, whose sum is σ = 97213422. Its totient is φ = 97213420.

The previous prime is 97213381. The next prime is 97213451. The reversal of 97213421 is 12431279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88153321 + 9060100 = 9389^2 + 3010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97213421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97213451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48606710 + 48606711.

It is an arithmetic number, because the mean of its divisors is an integer number (48606711).

Almost surely, 2^97213421 is an apocalyptic number.

It is an amenable number.

97213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

97213421 is an equidigital number, since it uses as much as digits as its factorization.

97213421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 97213421 is about 9859.6866583071. The cubic root of 97213421 is about 459.8068202706.

The spelling of 97213421 in words is "ninety-seven million, two hundred thirteen thousand, four hundred twenty-one".