11111321001 has 32 divisors (see below), whose sum is σ = 16691788800. Its totient is φ = 6515398080.

The previous prime is 11111320981. The next prime is 11111321003. The reversal of 11111321001 is 10012311111.

It is not a de Polignac number, because 11111321001 - 2⁹ = 11111320489 is a prime.

It is a super-2 number, since 2×11111321001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11111321003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193140 + ... + 243978.

It is an arithmetic number, because the mean of its divisors is an integer number (521618400).

Almost surely, 2^11111321001 is an apocalyptic number.

11111321001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111321001 is a deficient number, since it is larger than the sum of its proper divisors (5580467799).

11111321001 is a wasteful number, since it uses less digits than its factorization.

11111321001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51069.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 11111321001 its reverse (10012311111), we get a palindrome (21123632112).

The spelling of 11111321001 in words is "eleven billion, one hundred eleven million, three hundred twenty-one thousand, one".