33420143 has 4 divisors (see below), whose sum is σ = 33453960. Its totient is φ = 33386328.

The previous prime is 33420109. The next prime is 33420161. The reversal of 33420143 is 34102433.

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

It is a cyclic number.

It is not a de Polignac number, because 33420143 - 2²⁰ = 32371567 is a prime.

It is a super-2 number, since 2×33420143² = 2233811916280898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33420103) 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, 15380 + ... + 17417.

It is an arithmetic number, because the mean of its divisors is an integer number (8363490).

Almost surely, 2^33420143 is an apocalyptic number.

33420143 is a deficient number, since it is larger than the sum of its proper divisors (33817).

33420143 is a wasteful number, since it uses less digits than its factorization.

33420143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33816.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 33420143 is about 5781.0157411998. The cubic root of 33420143 is about 322.1089320627.

Adding to 33420143 its reverse (34102433), we get a palindrome (67522576).

The spelling of 33420143 in words is "thirty-three million, four hundred twenty thousand, one hundred forty-three".