21034155 has 8 divisors (see below), whose sum is σ = 33654672. Its totient is φ = 11218208.

The previous prime is 21034133. The next prime is 21034183. The reversal of 21034155 is 55143012.

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 21034155 - 2²⁰ = 19985579 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, 701124 + ... + 701153.

It is an arithmetic number, because the mean of its divisors is an integer number (4206834).

Almost surely, 2^21034155 is an apocalyptic number.

21034155 is a deficient number, since it is larger than the sum of its proper divisors (12620517).

21034155 is a wasteful number, since it uses less digits than its factorization.

21034155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402285.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21034155 is about 4586.3007969386. The cubic root of 21034155 is about 276.0419097249.

Adding to 21034155 its reverse (55143012), we get a palindrome (76177167).

The spelling of 21034155 in words is "twenty-one million, thirty-four thousand, one hundred fifty-five".