11111221221001 has 8 divisors (see below), whose sum is σ = 12121364673504. Its totient is φ = 10101083173920.

The previous prime is 11111221220951. The next prime is 11111221221259. The reversal of 11111221221001 is 10012212211111.

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

It is a cyclic number.

It is not a de Polignac number, because 11111221221001 - 2³¹ = 11109073737353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111221224001) 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, 3800685 + ... + 6055381.

It is an arithmetic number, because the mean of its divisors is an integer number (1515170584188).

Almost surely, 2^{11111221221001} is an apocalyptic number.

11111221221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111221221001 is a deficient number, since it is larger than the sum of its proper divisors (1010143452503).

11111221221001 is a wasteful number, since it uses less digits than its factorization.

11111221221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702711.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 11111221221001 its reverse (10012212211111), we get a palindrome (21123433432112).

The spelling of 11111221221001 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one".