30736221 has 16 divisors (see below), whose sum is σ = 44794368. Its totient is φ = 18662400.

The previous prime is 30736217. The next prime is 30736231. The reversal of 30736221 is 12263703.

It is not a de Polignac number, because 30736221 - 2² = 30736217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30736191 and 30736200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30736231) 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, 8140 + ... + 11301.

It is an arithmetic number, because the mean of its divisors is an integer number (2799648).

Almost surely, 2^30736221 is an apocalyptic number.

30736221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30736221 is a deficient number, since it is larger than the sum of its proper divisors (14058147).

30736221 is a wasteful number, since it uses less digits than its factorization.

30736221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19492.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 30736221 is about 5544.0257034036. The cubic root of 30736221 is about 313.2445257850.

Adding to 30736221 its reverse (12263703), we get a palindrome (42999924).

The spelling of 30736221 in words is "thirty million, seven hundred thirty-six thousand, two hundred twenty-one".