33423921 has 64 divisors (see below), whose sum is σ = 56678400. Its totient is φ = 19595520.

The previous prime is 33423917. The next prime is 33423937. The reversal of 33423921 is 12932433.

It is a happy number.

It is not a de Polignac number, because 33423921 - 2² = 33423917 is a prime.

It is a super-2 number, since 2×33423921² = 2234316990028482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33423941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1078176 + ... + 1078206.

It is an arithmetic number, because the mean of its divisors is an integer number (885600).

Almost surely, 2^33423921 is an apocalyptic number.

33423921 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

33423921 is a deficient number, since it is larger than the sum of its proper divisors (23254479).

33423921 is an equidigital number, since it uses as much as digits as its factorization.

33423921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 80 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 33423921 is about 5781.3424911520. The cubic root of 33423921 is about 322.1210692708.

The spelling of 33423921 in words is "thirty-three million, four hundred twenty-three thousand, nine hundred twenty-one".