74230216321621 has 2 divisors, whose sum is σ = 74230216321622. Its totient is φ = 74230216321620.

The previous prime is 74230216321603. The next prime is 74230216321631. The reversal of 74230216321621 is 12612361203247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71113971068100 + 3116245253521 = 8432910^2 + 1765289^2 .

It is a cyclic number.

It is not a de Polignac number, because 74230216321621 - 2⁵ = 74230216321589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74230216321631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37115108160810 + 37115108160811.

It is an arithmetic number, because the mean of its divisors is an integer number (37115108160811).

Almost surely, 2^{74230216321621} is an apocalyptic number.

It is an amenable number.

74230216321621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74230216321621 is an equidigital number, since it uses as much as digits as its factorization.

74230216321621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 40.

Adding to 74230216321621 its reverse (12612361203247), we get a palindrome (86842577524868).

The spelling of 74230216321621 in words is "seventy-four trillion, two hundred thirty billion, two hundred sixteen million, three hundred twenty-one thousand, six hundred twenty-one".