33221332381 has 2 divisors, whose sum is σ = 33221332382. Its totient is φ = 33221332380.

The previous prime is 33221332303. The next prime is 33221332387. The reversal of 33221332381 is 18323312233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32737112356 + 484220025 = 180934^2 + 22005^2 .

It is a cyclic number.

It is not a de Polignac number, because 33221332381 - 2¹¹ = 33221330333 is a prime.

It is a super-3 number, since 3×33221332381³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33221332387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610666190 + 16610666191.

It is an arithmetic number, because the mean of its divisors is an integer number (16610666191).

Almost surely, 2^33221332381 is an apocalyptic number.

It is an amenable number.

33221332381 is a deficient number, since it is larger than the sum of its proper divisors (1).

33221332381 is an equidigital number, since it uses as much as digits as its factorization.

33221332381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 31.

The spelling of 33221332381 in words is "thirty-three billion, two hundred twenty-one million, three hundred thirty-two thousand, three hundred eighty-one".