30219821491 has 4 divisors (see below), whose sum is σ = 30220233192. Its totient is φ = 30219409792.

The previous prime is 30219821431. The next prime is 30219821539. The reversal of 30219821491 is 19412891203.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30219821491 - 2¹⁵ = 30219788723 is a prime.

It is a super-2 number, since 2×30219821491² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30219821431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62446 + ... + 253651.

It is an arithmetic number, because the mean of its divisors is an integer number (7555058298).

Almost surely, 2^30219821491 is an apocalyptic number.

30219821491 is a deficient number, since it is larger than the sum of its proper divisors (411701).

30219821491 is an equidigital number, since it uses as much as digits as its factorization.

30219821491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411700.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 30219821491 in words is "thirty billion, two hundred nineteen million, eight hundred twenty-one thousand, four hundred ninety-one".