11211312031 has 8 divisors (see below), whose sum is σ = 11880076464. Its totient is φ = 10543578240.

The previous prime is 11211312029. The next prime is 11211312053. The reversal of 11211312031 is 13021311211.

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 11211312031 - 2¹ = 11211312029 is a prime.

It is a super-2 number, since 2×11211312031² (a number of 21 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 = 11211311996 and 11211312014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211312001) 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, 235200 + ... + 278821.

It is an arithmetic number, because the mean of its divisors is an integer number (1485009558).

Almost surely, 2^11211312031 is an apocalyptic number.

11211312031 is a deficient number, since it is larger than the sum of its proper divisors (668764433).

11211312031 is a wasteful number, since it uses less digits than its factorization.

11211312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515321.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11211312031 its reverse (13021311211), we get a palindrome (24232623242).

The spelling of 11211312031 in words is "eleven billion, two hundred eleven million, three hundred twelve thousand, thirty-one".