1111331021421 has 4 divisors (see below), whose sum is σ = 1481774695232. Its totient is φ = 740887347612.

The previous prime is 1111331021417. The next prime is 1111331021441. The reversal of 1111331021421 is 1241201331111.

It is a happy number.

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 not a de Polignac number, because 1111331021421 - 2² = 1111331021417 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 (1111331021441) 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, 185221836901 + ... + 185221836906.

It is an arithmetic number, because the mean of its divisors is an integer number (370443673808).

Almost surely, 2^{1111331021421} is an apocalyptic number.

It is an amenable number.

1111331021421 is a deficient number, since it is larger than the sum of its proper divisors (370443673811).

1111331021421 is an equidigital number, since it uses as much as digits as its factorization.

1111331021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370443673810.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 1111331021421 its reverse (1241201331111), we get a palindrome (2352532352532).

The spelling of 1111331021421 in words is "one trillion, one hundred eleven billion, three hundred thirty-one million, twenty-one thousand, four hundred twenty-one".