4011818243621 has 2 divisors, whose sum is σ = 4011818243622. Its totient is φ = 4011818243620.

The previous prime is 4011818243603. The next prime is 4011818243743. The reversal of 4011818243621 is 1263428181104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2630462296900 + 1381355946721 = 1621870^2 + 1175311^2 .

It is a cyclic number.

It is not a de Polignac number, because 4011818243621 - 2¹⁸ = 4011817981477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4011818213621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2005909121810 + 2005909121811.

It is an arithmetic number, because the mean of its divisors is an integer number (2005909121811).

Almost surely, 2^{4011818243621} is an apocalyptic number.

It is an amenable number.

4011818243621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4011818243621 is an equidigital number, since it uses as much as digits as its factorization.

4011818243621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 4011818243621 in words is "four trillion, eleven billion, eight hundred eighteen million, two hundred forty-three thousand, six hundred twenty-one".