30986421 has 4 divisors (see below), whose sum is σ = 41315232. Its totient is φ = 20657612.

The previous prime is 30986419. The next prime is 30986429. The reversal of 30986421 is 12468903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12468903 = 3 ⋅4156301.

It is a cyclic number.

It is not a de Polignac number, because 30986421 - 2¹ = 30986419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30986429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5164401 + ... + 5164406.

It is an arithmetic number, because the mean of its divisors is an integer number (10328808).

Almost surely, 2^30986421 is an apocalyptic number.

It is an amenable number.

30986421 is a deficient number, since it is larger than the sum of its proper divisors (10328811).

30986421 is a wasteful number, since it uses less digits than its factorization.

30986421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10328810.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 30986421 is about 5566.5447990652. The cubic root of 30986421 is about 314.0921910050.

The spelling of 30986421 in words is "thirty million, nine hundred eighty-six thousand, four hundred twenty-one".