16122821 has 16 divisors (see below), whose sum is σ = 19557888. Its totient is φ = 13089600.

The previous prime is 16122803. The next prime is 16122823. The reversal of 16122821 is 12822161.

16122821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16122821 - 2¹⁴ = 16106437 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 (16122823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2615 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (1222368).

Almost surely, 2^16122821 is an apocalyptic number.

16122821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16122821 is a deficient number, since it is larger than the sum of its proper divisors (3435067).

16122821 is a wasteful number, since it uses less digits than its factorization.

16122821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692.

The product of its digits is 384, while the sum is 23.

The square root of 16122821 is about 4015.3232746567. The cubic root of 16122821 is about 252.6273370077.

Adding to 16122821 its reverse (12822161), we get a palindrome (28944982).

The spelling of 16122821 in words is "sixteen million, one hundred twenty-two thousand, eight hundred twenty-one".