16921155 has 16 divisors (see below), whose sum is σ = 27133344. Its totient is φ = 9004800.

The previous prime is 16921129. The next prime is 16921183. The reversal of 16921155 is 55112961.

It is not a de Polignac number, because 16921155 - 2⁹ = 16920643 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8077 + ... + 9953.

It is an arithmetic number, because the mean of its divisors is an integer number (1695834).

Almost surely, 2^16921155 is an apocalyptic number.

16921155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16921155 is a deficient number, since it is larger than the sum of its proper divisors (10212189).

16921155 is a wasteful number, since it uses less digits than its factorization.

16921155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486.

The product of its digits is 2700, while the sum is 30.

The square root of 16921155 is about 4113.5331528991. The cubic root of 16921155 is about 256.7300278347.

The spelling of 16921155 in words is "sixteen million, nine hundred twenty-one thousand, one hundred fifty-five".