30636021 has 16 divisors (see below), whose sum is σ = 44089920. Its totient is φ = 18810240.

The previous prime is 30635993. The next prime is 30636041. The reversal of 30636021 is 12063603.

It is not a de Polignac number, because 30636021 - 2⁷ = 30635893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30636041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31066 + ... + 32036.

It is an arithmetic number, because the mean of its divisors is an integer number (2755620).

Almost surely, 2^30636021 is an apocalyptic number.

It is an amenable number.

30636021 is a deficient number, since it is larger than the sum of its proper divisors (13453899).

30636021 is a wasteful number, since it uses less digits than its factorization.

30636021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 30636021 is about 5534.9815717850. The cubic root of 30636021 is about 312.9037631098.

Adding to 30636021 its reverse (12063603), we get a palindrome (42699624).

It can be divided in two parts, 3063602 and 1, that added together give a palindrome (3063603).

The spelling of 30636021 in words is "thirty million, six hundred thirty-six thousand, twenty-one".