16221293 has 4 divisors (see below), whose sum is σ = 17695968. Its totient is φ = 14746620.

The previous prime is 16221253. The next prime is 16221311. The reversal of 16221293 is 39212261.

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: 39212261 = 11 ⋅3564751.

It is a cyclic number.

It is not a de Polignac number, because 16221293 - 2¹² = 16217197 is a prime.

It is a Duffinian 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 (16221203) 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, 737321 + ... + 737342.

It is an arithmetic number, because the mean of its divisors is an integer number (4423992).

Almost surely, 2^16221293 is an apocalyptic number.

It is an amenable number.

16221293 is a deficient number, since it is larger than the sum of its proper divisors (1474675).

16221293 is a wasteful number, since it uses less digits than its factorization.

16221293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474674.

The product of its digits is 1296, while the sum is 26.

The square root of 16221293 is about 4027.5666350788. The cubic root of 16221293 is about 253.1406103872.

The spelling of 16221293 in words is "sixteen million, two hundred twenty-one thousand, two hundred ninety-three".