210005155 has 24 divisors (see below), whose sum is σ = 263796912. Its totient is φ = 160363584.

The previous prime is 210005141. The next prime is 210005197. The reversal of 210005155 is 551500012.

It is not a de Polignac number, because 210005155 - 2¹⁹ = 209480867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1962612 + ... + 1962718.

It is an arithmetic number, because the mean of its divisors is an integer number (10991538).

Almost surely, 2^210005155 is an apocalyptic number.

210005155 is a deficient number, since it is larger than the sum of its proper divisors (53791757).

210005155 is a wasteful number, since it uses less digits than its factorization.

210005155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 210005155 is about 14491.5546094958. The cubic root of 210005155 is about 594.3970588742.

Adding to 210005155 its reverse (551500012), we get a palindrome (761505167).

The spelling of 210005155 in words is "two hundred ten million, five thousand, one hundred fifty-five".