211550013 has 18 divisors (see below), whose sum is σ = 310712922. Its totient is φ = 138699360.

The previous prime is 211550011. The next prime is 211550029. The reversal of 211550013 is 310055112.

It can be written as a sum of positive squares in 3 ways, for example, as 7717284 + 203832729 = 2778^2 + 14277^2 .

It is not a de Polignac number, because 211550013 - 2¹ = 211550011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211550011) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30331 + ... + 36647.

It is an arithmetic number, because the mean of its divisors is an integer number (17261829).

Almost surely, 2^211550013 is an apocalyptic number.

It is an amenable number.

211550013 is a deficient number, since it is larger than the sum of its proper divisors (99162909).

211550013 is an equidigital number, since it uses as much as digits as its factorization.

211550013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445 (or 6381 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 211550013 is about 14544.7589529700. The cubic root of 211550013 is about 595.8510177069.

The spelling of 211550013 in words is "two hundred eleven million, five hundred fifty thousand, thirteen".