213005551 has 16 divisors (see below), whose sum is σ = 245514240. Its totient is φ = 182973280.

The previous prime is 213005549. The next prime is 213005591. The reversal of 213005551 is 155500312.

It is a cyclic number.

It is not a de Polignac number, because 213005551 - 2¹ = 213005549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213005591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7890 + ... + 22096.

It is an arithmetic number, because the mean of its divisors is an integer number (15344640).

Almost surely, 2^213005551 is an apocalyptic number.

213005551 is a deficient number, since it is larger than the sum of its proper divisors (32508689).

213005551 is a wasteful number, since it uses less digits than its factorization.

213005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14294.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 213005551 is about 14594.7096922138. The cubic root of 213005551 is about 597.2144499010.

Adding to 213005551 its reverse (155500312), we get a palindrome (368505863).

The spelling of 213005551 in words is "two hundred thirteen million, five thousand, five hundred fifty-one".