21346155 has 12 divisors (see below), whose sum is σ = 37000080. Its totient is φ = 11384592.

The previous prime is 21346153. The next prime is 21346181. The reversal of 21346155 is 55164312.

It is not a de Polignac number, because 21346155 - 2¹ = 21346153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21346153) 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, 237135 + ... + 237224.

It is an arithmetic number, because the mean of its divisors is an integer number (3083340).

Almost surely, 2^21346155 is an apocalyptic number.

21346155 is a deficient number, since it is larger than the sum of its proper divisors (15653925).

21346155 is a wasteful number, since it uses less digits than its factorization.

21346155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474370 (or 474367 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 21346155 is about 4620.1899311608. The cubic root of 21346155 is about 277.4000614072.

The spelling of 21346155 in words is "twenty-one million, three hundred forty-six thousand, one hundred fifty-five".