211227252740 has 36 divisors (see below), whose sum is σ = 515998005516. Its totient is φ = 72420772032.

The previous prime is 211227252737. The next prime is 211227252763. The reversal of 211227252740 is 47252722112.

It can be written as a sum of positive squares in 2 ways, for example, as 25884948544 + 185342304196 = 160888^2 + 430514^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 211227252740.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107768027 + ... + 107769986.

It is an arithmetic number, because the mean of its divisors is an integer number (14333277931).

Almost surely, 2^211227252740 is an apocalyptic number.

211227252740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211227252740 is an abundant number, since it is smaller than the sum of its proper divisors (304770752776).

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

211227252740 is a wasteful number, since it uses less digits than its factorization.

211227252740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215538036 (or 215538027 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

Adding to 211227252740 its reverse (47252722112), we get a palindrome (258479974852).

The spelling of 211227252740 in words is "two hundred eleven billion, two hundred twenty-seven million, two hundred fifty-two thousand, seven hundred forty".