213520155 has 64 divisors (see below), whose sum is σ = 375598080. Its totient is φ = 103251456.

The previous prime is 213520121. The next prime is 213520159. The reversal of 213520155 is 551025312.

It is a happy number.

It is not a de Polignac number, because 213520155 - 2⁶ = 213520091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213520159) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 548701 + ... + 549089.

It is an arithmetic number, because the mean of its divisors is an integer number (5868720).

Almost surely, 2^213520155 is an apocalyptic number.

213520155 is a deficient number, since it is larger than the sum of its proper divisors (162077925).

213520155 is a wasteful number, since it uses less digits than its factorization.

213520155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 213520155 is about 14612.3288698277. The cubic root of 213520155 is about 597.6950035471.

Adding to 213520155 its reverse (551025312), we get a palindrome (764545467).

The spelling of 213520155 in words is "two hundred thirteen million, five hundred twenty thousand, one hundred fifty-five".