67237421 has 2 divisors, whose sum is σ = 67237422. Its totient is φ = 67237420.

The previous prime is 67237369. The next prime is 67237427. The reversal of 67237421 is 12473276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 2515396 = 8045^2 + 1586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67237421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67237427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33618710 + 33618711.

It is an arithmetic number, because the mean of its divisors is an integer number (33618711).

Almost surely, 2^67237421 is an apocalyptic number.

It is an amenable number.

67237421 is a deficient number, since it is larger than the sum of its proper divisors (1).

67237421 is an equidigital number, since it uses as much as digits as its factorization.

67237421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 32.

The square root of 67237421 is about 8199.8427423945. The cubic root of 67237421 is about 406.6339941352.

The spelling of 67237421 in words is "sixty-seven million, two hundred thirty-seven thousand, four hundred twenty-one".