30630821 has 24 divisors (see below), whose sum is σ = 36309504. Its totient is φ = 25655040.

The previous prime is 30630791. The next prime is 30630823. The reversal of 30630821 is 12803603.

It is not a de Polignac number, because 30630821 - 2¹⁸ = 30368677 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 (30630823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116336 + ... + 116598.

It is an arithmetic number, because the mean of its divisors is an integer number (1512896).

Almost surely, 2^30630821 is an apocalyptic number.

30630821 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30630821 is a deficient number, since it is larger than the sum of its proper divisors (5678683).

30630821 is a wasteful number, since it uses less digits than its factorization.

30630821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 30630821 is about 5534.5118122559. The cubic root of 30630821 is about 312.8860585517.

The spelling of 30630821 in words is "thirty million, six hundred thirty thousand, eight hundred twenty-one".