33542921 has 4 divisors (see below), whose sum is σ = 35516052. Its totient is φ = 31569792.

The previous prime is 33542903. The next prime is 33542939. The reversal of 33542921 is 12924533.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12924533 = 661 ⋅19553.

It is an interprime number because it is at equal distance from previous prime (33542903) and next prime (33542939).

It can be written as a sum of positive squares in 2 ways, for example, as 23232400 + 10310521 = 4820^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 33542921 - 2²² = 29348617 is a prime.

It is a super-2 number, since 2×33542921² = 2250255098424482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33542981) 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, 986540 + ... + 986573.

It is an arithmetic number, because the mean of its divisors is an integer number (8879013).

Almost surely, 2^33542921 is an apocalyptic number.

It is an amenable number.

33542921 is a deficient number, since it is larger than the sum of its proper divisors (1973131).

33542921 is a wasteful number, since it uses less digits than its factorization.

33542921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973130.

The product of its digits is 6480, while the sum is 29.

The square root of 33542921 is about 5791.6250741912. The cubic root of 33542921 is about 322.5029016425.

The spelling of 33542921 in words is "thirty-three million, five hundred forty-two thousand, nine hundred twenty-one".