111212231421 has 4 divisors (see below), whose sum is σ = 148282975232. Its totient is φ = 74141487612.

The previous prime is 111212231419. The next prime is 111212231423. The reversal of 111212231421 is 124132212111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (111212231419) and next prime (111212231423).

It is not a de Polignac number, because 111212231421 - 2¹ = 111212231419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212231423) 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, 18535371901 + ... + 18535371906.

It is an arithmetic number, because the mean of its divisors is an integer number (37070743808).

Almost surely, 2^111212231421 is an apocalyptic number.

It is an amenable number.

111212231421 is a deficient number, since it is larger than the sum of its proper divisors (37070743811).

111212231421 is an equidigital number, since it uses as much as digits as its factorization.

111212231421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37070743810.

The product of its digits is 192, while the sum is 21.

Adding to 111212231421 its reverse (124132212111), we get a palindrome (235344443532).

The spelling of 111212231421 in words is "one hundred eleven billion, two hundred twelve million, two hundred thirty-one thousand, four hundred twenty-one".