211525402013 has 4 divisors (see below), whose sum is σ = 215516447388. Its totient is φ = 207534356640.

The previous prime is 211525401979. The next prime is 211525402057. The reversal of 211525402013 is 310204525112.

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 163570095844 + 47955306169 = 404438^2 + 218987^2 .

It is a cyclic number.

It is not a de Polignac number, because 211525402013 - 2¹² = 211525397917 is a prime.

It is a super-2 number, since 2×211525402013² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211525402063) 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, 1995522608 + ... + 1995522713.

It is an arithmetic number, because the mean of its divisors is an integer number (53879111847).

Almost surely, 2^211525402013 is an apocalyptic number.

It is an amenable number.

211525402013 is a deficient number, since it is larger than the sum of its proper divisors (3991045375).

211525402013 is an equidigital number, since it uses as much as digits as its factorization.

211525402013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991045374.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 211525402013 its reverse (310204525112), we get a palindrome (521729927125).

The spelling of 211525402013 in words is "two hundred eleven billion, five hundred twenty-five million, four hundred two thousand, thirteen".