1084616821 has 4 divisors (see below), whose sum is σ = 1109840512. Its totient is φ = 1059393132.

The previous prime is 1084616801. The next prime is 1084616839. The reversal of 1084616821 is 1286164801.

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.

It is a cyclic number.

It is not a de Polignac number, because 1084616821 - 2⁵ = 1084616789 is a prime.

It is a super-2 number, since 2×1084616821² = 2352787296792292082, 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 (1084616801) 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, 12611781 + ... + 12611866.

It is an arithmetic number, because the mean of its divisors is an integer number (277460128).

Almost surely, 2^1084616821 is an apocalyptic number.

It is an amenable number.

1084616821 is a deficient number, since it is larger than the sum of its proper divisors (25223691).

1084616821 is an equidigital number, since it uses as much as digits as its factorization.

1084616821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25223690.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1084616821 is about 32933.5212359687. The cubic root of 1084616821 is about 1027.4454624609.

The spelling of 1084616821 in words is "one billion, eighty-four million, six hundred sixteen thousand, eight hundred twenty-one".