211552254440 has 16 divisors (see below), whose sum is σ = 475992572580. Its totient is φ = 84620901760.

The previous prime is 211552254391. The next prime is 211552254451. The reversal of 211552254440 is 44452255112.

It can be written as a sum of positive squares in 2 ways, for example, as 185869627876 + 25682626564 = 431126^2 + 160258^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211552254440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2644403141 + ... + 2644403220.

Almost surely, 2^211552254440 is an apocalyptic number.

211552254440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211552254440 is an abundant number, since it is smaller than the sum of its proper divisors (264440318140).

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

211552254440 is a wasteful number, since it uses less digits than its factorization.

211552254440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288806372 (or 5288806368 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

The spelling of 211552254440 in words is "two hundred eleven billion, five hundred fifty-two million, two hundred fifty-four thousand, four hundred forty".