11405635421 has 2 divisors, whose sum is σ = 11405635422. Its totient is φ = 11405635420.

The previous prime is 11405635399. The next prime is 11405635433. The reversal of 11405635421 is 12453650411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9634404025 + 1771231396 = 98155^2 + 42086^2 .

It is a cyclic number.

It is not a de Polignac number, because 11405635421 - 2⁶ = 11405635357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11405635621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5702817710 + 5702817711.

It is an arithmetic number, because the mean of its divisors is an integer number (5702817711).

Almost surely, 2^11405635421 is an apocalyptic number.

It is an amenable number.

11405635421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11405635421 is an equidigital number, since it uses as much as digits as its factorization.

11405635421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 11405635421 in words is "eleven billion, four hundred five million, six hundred thirty-five thousand, four hundred twenty-one".