33400421 has 4 divisors (see below), whose sum is σ = 33429612. Its totient is φ = 33371232.

The previous prime is 33400417. The next prime is 33400453. The reversal of 33400421 is 12400433.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25391521 + 8008900 = 5039^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 33400421 - 2² = 33400417 is a prime.

It is a super-3 number, since 3×33400421³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 33400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33400481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12806 + ... + 15191.

It is an arithmetic number, because the mean of its divisors is an integer number (8357403).

Almost surely, 2^33400421 is an apocalyptic number.

It is an amenable number.

33400421 is a deficient number, since it is larger than the sum of its proper divisors (29191).

33400421 is a wasteful number, since it uses less digits than its factorization.

33400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29190.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 33400421 is about 5779.3097338696. The cubic root of 33400421 is about 322.0455582826.

Adding to 33400421 its reverse (12400433), we get a palindrome (45800854).

The spelling of 33400421 in words is "thirty-three million, four hundred thousand, four hundred twenty-one".