33999421 has 2 divisors, whose sum is σ = 33999422. Its totient is φ = 33999420.

The previous prime is 33999409. The next prime is 33999443. The reversal of 33999421 is 12499933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29648025 + 4351396 = 5445^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 33999421 - 2¹¹ = 33997373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33999461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16999710 + 16999711.

It is an arithmetic number, because the mean of its divisors is an integer number (16999711).

Almost surely, 2^33999421 is an apocalyptic number.

It is an amenable number.

33999421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33999421 is an equidigital number, since it uses as much as digits as its factorization.

33999421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 33999421 is about 5830.9022457935. The cubic root of 33999421 is about 323.9593411612.

The spelling of 33999421 in words is "thirty-three million, nine hundred ninety-nine thousand, four hundred twenty-one".