33131203421 has 2 divisors, whose sum is σ = 33131203422. Its totient is φ = 33131203420.

The previous prime is 33131203403. The next prime is 33131203493. The reversal of 33131203421 is 12430213133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28219296196 + 4911907225 = 167986^2 + 70085^2 .

It is a cyclic number.

It is not a de Polignac number, because 33131203421 - 2³⁴ = 15951334237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33131203121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16565601710 + 16565601711.

It is an arithmetic number, because the mean of its divisors is an integer number (16565601711).

Almost surely, 2^33131203421 is an apocalyptic number.

It is an amenable number.

33131203421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33131203421 is an equidigital number, since it uses as much as digits as its factorization.

33131203421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 33131203421 its reverse (12430213133), we get a palindrome (45561416554).

The spelling of 33131203421 in words is "thirty-three billion, one hundred thirty-one million, two hundred three thousand, four hundred twenty-one".