11212123531 has 8 divisors (see below), whose sum is σ = 12817514720. Its totient is φ = 9607647168.

The previous prime is 11212123529. The next prime is 11212123547. The reversal of 11212123531 is 13532121211.

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

It is not a de Polignac number, because 11212123531 - 2¹ = 11212123529 is a prime.

It is a super-2 number, since 2×11212123531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212123561) 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, 202236 + ... + 251641.

It is an arithmetic number, because the mean of its divisors is an integer number (1602189340).

Almost surely, 2^11212123531 is an apocalyptic number.

11212123531 is a deficient number, since it is larger than the sum of its proper divisors (1605391189).

11212123531 is an equidigital number, since it uses as much as digits as its factorization.

11212123531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457413.

The product of its digits is 360, while the sum is 22.

Adding to 11212123531 its reverse (13532121211), we get a palindrome (24744244742).

The spelling of 11212123531 in words is "eleven billion, two hundred twelve million, one hundred twenty-three thousand, five hundred thirty-one".