213481018 has 4 divisors (see below), whose sum is σ = 320221530. Its totient is φ = 106740508.

The previous prime is 213481013. The next prime is 213481067. The reversal of 213481018 is 810184312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 207849889 + 5631129 = 14417^2 + 2373^2 .

It is not an unprimeable number, because it can be changed into a prime (213481013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53370253 + ... + 53370256.

Almost surely, 2^213481018 is an apocalyptic number.

213481018 is a deficient number, since it is larger than the sum of its proper divisors (106740512).

213481018 is a wasteful number, since it uses less digits than its factorization.

213481018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106740511.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 213481018 is about 14610.9896310962. The cubic root of 213481018 is about 597.6584833121.

It can be divided in two parts, 21348 and 1018, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 213481018 in words is "two hundred thirteen million, four hundred eighty-one thousand, eighteen".