211215314531 has 8 divisors (see below), whose sum is σ = 227466324960. Its totient is φ = 194964829632.

The previous prime is 211215314521. The next prime is 211215314549. The reversal of 211215314531 is 135413512112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211215314531 - 2¹⁸ = 211215052387 is a prime.

It is a super-2 number, since 2×211215314531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211215314494 and 211215314503.

It is not an unprimeable number, because it can be changed into a prime (211215314501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1212671 + ... + 1375863.

It is an arithmetic number, because the mean of its divisors is an integer number (28433290620).

Almost surely, 2^211215314531 is an apocalyptic number.

211215314531 is a deficient number, since it is larger than the sum of its proper divisors (16251010429).

211215314531 is a wasteful number, since it uses less digits than its factorization.

211215314531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262765.

The product of its digits is 3600, while the sum is 29.

Adding to 211215314531 its reverse (135413512112), we get a palindrome (346628826643).

The spelling of 211215314531 in words is "two hundred eleven billion, two hundred fifteen million, three hundred fourteen thousand, five hundred thirty-one".