213127720 has 32 divisors (see below), whose sum is σ = 516426120. Its totient is φ = 78693120.

The previous prime is 213127711. The next prime is 213127723. The reversal of 213127720 is 27721312.

It can be written as a sum of positive squares in 4 ways, for example, as 71470116 + 141657604 = 8454^2 + 11902^2 .

It is not an unprimeable number, because it can be changed into a prime (213127723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204411 + ... + 205450.

Almost surely, 2^213127720 is an apocalyptic number.

213127720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213127720 is an abundant number, since it is smaller than the sum of its proper divisors (303298400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213127720 is a wasteful number, since it uses less digits than its factorization.

213127720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409885 (or 409881 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 213127720 is about 14598.8944786926. The cubic root of 213127720 is about 597.3286052165.

The spelling of 213127720 in words is "two hundred thirteen million, one hundred twenty-seven thousand, seven hundred twenty".