21111112221001 has 8 divisors (see below), whose sum is σ = 23158965160800. Its totient is φ = 19084702767840.

The previous prime is 21111112220987. The next prime is 21111112221071. The reversal of 21111112221001 is 10012221111112.

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 21111112221001 - 2⁵ = 21111112220969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111112221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5360869596 + ... + 5360873533.

It is an arithmetic number, because the mean of its divisors is an integer number (2894870645100).

Almost surely, 2^{21111112221001} is an apocalyptic number.

It is an amenable number.

21111112221001 is a deficient number, since it is larger than the sum of its proper divisors (2047852939799).

21111112221001 is a wasteful number, since it uses less digits than its factorization.

21111112221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10721743319.

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

Adding to 21111112221001 its reverse (10012221111112), we get a palindrome (31123333332113).

The spelling of 21111112221001 in words is "twenty-one trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, one".