21376155 has 8 divisors (see below), whose sum is σ = 34201872. Its totient is φ = 11400608.

The previous prime is 21376141. The next prime is 21376163. The reversal of 21376155 is 55167312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21376155 - 2⁷ = 21376027 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712524 + ... + 712553.

It is an arithmetic number, because the mean of its divisors is an integer number (4275234).

Almost surely, 2^21376155 is an apocalyptic number.

21376155 is a deficient number, since it is larger than the sum of its proper divisors (12825717).

21376155 is a wasteful number, since it uses less digits than its factorization.

21376155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425085.

The product of its digits is 6300, while the sum is 30.

The square root of 21376155 is about 4623.4354110337. The cubic root of 21376155 is about 277.5299537506.

The spelling of 21376155 in words is "twenty-one million, three hundred seventy-six thousand, one hundred fifty-five".