35811821809421 has 16 divisors (see below), whose sum is σ = 41186069379840. Its totient is φ = 30502260322560.

The previous prime is 35811821809403. The next prime is 35811821809429. The reversal of 35811821809421 is 12490812811853.

It is a cyclic number.

It is not a de Polignac number, because 35811821809421 - 2³⁴ = 35794641940237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35811821809429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1259366 + ... + 8556263.

It is an arithmetic number, because the mean of its divisors is an integer number (2574129336240).

Almost surely, 2^{35811821809421} is an apocalyptic number.

It is an amenable number.

35811821809421 is a deficient number, since it is larger than the sum of its proper divisors (5374247570419).

35811821809421 is a wasteful number, since it uses less digits than its factorization.

35811821809421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9818924.

The product of its (nonzero) digits is 1105920, while the sum is 53.

The spelling of 35811821809421 in words is "thirty-five trillion, eight hundred eleven billion, eight hundred twenty-one million, eight hundred nine thousand, four hundred twenty-one".