16766421 has 16 divisors (see below), whose sum is σ = 25901184. Its totient is φ = 9448704.

The previous prime is 16766419. The next prime is 16766429. The reversal of 16766421 is 12466761.

It is not a de Polignac number, because 16766421 - 2¹ = 16766419 is a prime.

It is a super-2 number, since 2×16766421² = 562225746298482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16766429) 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, 3936 + ... + 7001.

It is an arithmetic number, because the mean of its divisors is an integer number (1618824).

Almost surely, 2^16766421 is an apocalyptic number.

It is an amenable number.

16766421 is a deficient number, since it is larger than the sum of its proper divisors (9134763).

16766421 is a wasteful number, since it uses less digits than its factorization.

16766421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020.

The product of its digits is 12096, while the sum is 33.

The square root of 16766421 is about 4094.6820389378. The cubic root of 16766421 is about 255.9450820103.

The spelling of 16766421 in words is "sixteen million, seven hundred sixty-six thousand, four hundred twenty-one".