213661011 has 4 divisors (see below), whose sum is σ = 284881352. Its totient is φ = 142440672.

The previous prime is 213660991. The next prime is 213661031. The reversal of 213661011 is 110166312.

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

It is an interprime number because it is at equal distance from previous prime (213660991) and next prime (213661031).

It is not a de Polignac number, because 213661011 - 2²⁵ = 180106579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213661031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35610166 + ... + 35610171.

It is an arithmetic number, because the mean of its divisors is an integer number (71220338).

Almost surely, 2^213661011 is an apocalyptic number.

213661011 is a deficient number, since it is larger than the sum of its proper divisors (71220341).

213661011 is an equidigital number, since it uses as much as digits as its factorization.

213661011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71220340.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 213661011 is about 14617.1478408067. The cubic root of 213661011 is about 597.8264047592.

The spelling of 213661011 in words is "two hundred thirteen million, six hundred sixty-one thousand, eleven".