11111221210101 has 64 divisors (see below), whose sum is σ = 16265139033600. Its totient is φ = 6715679072256.

The previous prime is 11111221210069. The next prime is 11111221210121. The reversal of 11111221210101 is 10101212211111.

It is not a de Polignac number, because 11111221210101 - 2⁵ = 11111221210069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221210121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1627060755 + ... + 1627067583.

It is an arithmetic number, because the mean of its divisors is an integer number (254142797400).

Almost surely, 2^{11111221210101} is an apocalyptic number.

It is an amenable number.

11111221210101 is a deficient number, since it is larger than the sum of its proper divisors (5153917823499).

11111221210101 is a wasteful number, since it uses less digits than its factorization.

11111221210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9278.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 11111221210101 its reverse (10101212211111), we get a palindrome (21212433421212).

The spelling of 11111221210101 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".