30821069 has 4 divisors (see below), whose sum is σ = 31343520. Its totient is φ = 30298620.

The previous prime is 30821057. The next prime is 30821093. The reversal of 30821069 is 96012803.

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: 96012803 = 71 ⋅1352293.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30821069 is a prime.

It is a super-2 number, since 2×30821069² = 1899876588605522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30821039) 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, 261137 + ... + 261254.

It is an arithmetic number, because the mean of its divisors is an integer number (7835880).

Almost surely, 2^30821069 is an apocalyptic number.

It is an amenable number.

30821069 is a deficient number, since it is larger than the sum of its proper divisors (522451).

30821069 is an equidigital number, since it uses as much as digits as its factorization.

30821069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522450.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 30821069 is about 5551.6726308384. The cubic root of 30821069 is about 313.5325003804.

The spelling of 30821069 in words is "thirty million, eight hundred twenty-one thousand, sixty-nine".