211390524421 has 4 divisors (see below), whose sum is σ = 211394808844. Its totient is φ = 211386240000.

The previous prime is 211390524419. The next prime is 211390524431. The reversal of 211390524421 is 124425093112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 196576956900 + 14813567521 = 443370^2 + 121711^2 .

It is a cyclic number.

It is not a de Polignac number, because 211390524421 - 2¹ = 211390524419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211390524431) 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, 2067330 + ... + 2167171.

It is an arithmetic number, because the mean of its divisors is an integer number (52848702211).

Almost surely, 2^211390524421 is an apocalyptic number.

It is an amenable number.

211390524421 is a deficient number, since it is larger than the sum of its proper divisors (4284423).

211390524421 is an equidigital number, since it uses as much as digits as its factorization.

211390524421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284422.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 211390524421 in words is "two hundred eleven billion, three hundred ninety million, five hundred twenty-four thousand, four hundred twenty-one".