4367785720421 has 2 divisors, whose sum is σ = 4367785720422. Its totient is φ = 4367785720420.

The previous prime is 4367785720357. The next prime is 4367785720477. The reversal of 4367785720421 is 1240275877634.

It is an a-pointer prime, because the next prime (4367785720477) can be obtained adding 4367785720421 to its sum of digits (56).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3033818469796 + 1333967250625 = 1741786^2 + 1154975^2 .

It is a cyclic number.

It is not a de Polignac number, because 4367785720421 - 2⁶ = 4367785720357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4367785720021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2183892860210 + 2183892860211.

It is an arithmetic number, because the mean of its divisors is an integer number (2183892860211).

Almost surely, 2^{4367785720421} is an apocalyptic number.

It is an amenable number.

4367785720421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4367785720421 is an equidigital number, since it uses as much as digits as its factorization.

4367785720421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15805440, while the sum is 56.

The spelling of 4367785720421 in words is "four trillion, three hundred sixty-seven billion, seven hundred eighty-five million, seven hundred twenty thousand, four hundred twenty-one".