30542021 has 4 divisors (see below), whose sum is σ = 30580044. Its totient is φ = 30504000.

The previous prime is 30542011. The next prime is 30542023. The reversal of 30542021 is 12024503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12024503 = 61 ⋅197123.

It can be written as a sum of positive squares in 2 ways, for example, as 4389025 + 26152996 = 2095^2 + 5114^2 .

It is a cyclic number.

It is not a de Polignac number, because 30542021 - 2⁶ = 30541957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30542023) 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, 17780 + ... + 19421.

It is an arithmetic number, because the mean of its divisors is an integer number (7645011).

Almost surely, 2^30542021 is an apocalyptic number.

It is an amenable number.

30542021 is a deficient number, since it is larger than the sum of its proper divisors (38023).

30542021 is an equidigital number, since it uses as much as digits as its factorization.

30542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38022.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 30542021 is about 5526.4836017128. The cubic root of 30542021 is about 312.5834094152.

Adding to 30542021 its reverse (12024503), we get a palindrome (42566524).

The spelling of 30542021 in words is "thirty million, five hundred forty-two thousand, twenty-one".