211215450013 has 4 divisors (see below), whose sum is σ = 211378300540. Its totient is φ = 211052599488.

The previous prime is 211215449983. The next prime is 211215450023. The reversal of 211215450013 is 310054512112.

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 156326925924 + 54888524089 = 395382^2 + 234283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211215450013 is a prime.

It is a super-2 number, since 2×211215450013² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211215450013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211215450023) 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, 81423318 + ... + 81425911.

It is an arithmetic number, because the mean of its divisors is an integer number (52844575135).

Almost surely, 2^211215450013 is an apocalyptic number.

It is an amenable number.

211215450013 is a deficient number, since it is larger than the sum of its proper divisors (162850527).

211215450013 is a wasteful number, since it uses less digits than its factorization.

211215450013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162850526.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 211215450013 its reverse (310054512112), we get a palindrome (521269962125).

The spelling of 211215450013 in words is "two hundred eleven billion, two hundred fifteen million, four hundred fifty thousand, thirteen".