1111212421 has 4 divisors (see below), whose sum is σ = 1212231744. Its totient is φ = 1010193100.

The previous prime is 1111212419. The next prime is 1111212433. The reversal of 1111212421 is 1242121111.

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 a cyclic number.

It is not a de Polignac number, because 1111212421 - 2¹ = 1111212419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111212395 and 1111212404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50509645 + ... + 50509666.

It is an arithmetic number, because the mean of its divisors is an integer number (303057936).

Almost surely, 2^1111212421 is an apocalyptic number.

1111212421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111212421 is a deficient number, since it is larger than the sum of its proper divisors (101019323).

1111212421 is a wasteful number, since it uses less digits than its factorization.

1111212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101019322.

The product of its digits is 32, while the sum is 16.

The square root of 1111212421 is about 33334.8529470283. The cubic root of 1111212421 is about 1035.7756470326.

Adding to 1111212421 its reverse (1242121111), we get a palindrome (2353333532).

The spelling of 1111212421 in words is "one billion, one hundred eleven million, two hundred twelve thousand, four hundred twenty-one".