213521104 has 10 divisors (see below), whose sum is σ = 413697170. Its totient is φ = 106760544.

The previous prime is 213521083. The next prime is 213521123. The reversal of 213521104 is 401125312.

It can be written as a sum of positive squares in only one way, i.e., 189117504 + 24403600 = 13752^2 + 4940^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6672519 + ... + 6672550.

It is an arithmetic number, because the mean of its divisors is an integer number (41369717).

Almost surely, 2^213521104 is an apocalyptic number.

It is an amenable number.

213521104 is a deficient number, since it is larger than the sum of its proper divisors (200176066).

213521104 is a wasteful number, since it uses less digits than its factorization.

213521104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13345077 (or 13345071 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 213521104 is about 14612.3613423704. The cubic root of 213521104 is about 597.6958890400.

Adding to 213521104 its reverse (401125312), we get a palindrome (614646416).

The spelling of 213521104 in words is "two hundred thirteen million, five hundred twenty-one thousand, one hundred four".