16221053 has 4 divisors (see below), whose sum is σ = 16369980. Its totient is φ = 16072128.

The previous prime is 16221031. The next prime is 16221061. The reversal of 16221053 is 35012261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10252804 + 5968249 = 3202^2 + 2443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16221053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221253) 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, 74300 + ... + 74517.

It is an arithmetic number, because the mean of its divisors is an integer number (4092495).

Almost surely, 2^16221053 is an apocalyptic number.

It is an amenable number.

16221053 is a deficient number, since it is larger than the sum of its proper divisors (148927).

16221053 is a wasteful number, since it uses less digits than its factorization.

16221053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148926.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 16221053 is about 4027.5368403033. The cubic root of 16221053 is about 253.1393619449.

The spelling of 16221053 in words is "sixteen million, two hundred twenty-one thousand, fifty-three".