16377921 has 12 divisors (see below), whose sum is σ = 27036672. Its totient is φ = 9358776.

The previous prime is 16377917. The next prime is 16377937. The reversal of 16377921 is 12977361.

It is a happy number.

16377921 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16377921 - 2² = 16377917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16377941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129921 + ... + 130046.

It is an arithmetic number, because the mean of its divisors is an integer number (2253056).

Almost surely, 2^16377921 is an apocalyptic number.

It is an amenable number.

16377921 is a deficient number, since it is larger than the sum of its proper divisors (10658751).

16377921 is a wasteful number, since it uses less digits than its factorization.

16377921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259980 (or 259977 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 16377921 is about 4046.9644179310. The cubic root of 16377921 is about 253.9527522840.

The spelling of 16377921 in words is "sixteen million, three hundred seventy-seven thousand, nine hundred twenty-one".