101221012111 has 16 divisors (see below), whose sum is σ = 108671220000. Its totient is φ = 93937701888.

The previous prime is 101221012099. The next prime is 101221012153. The reversal of 101221012111 is 111210122101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 101221012111 - 2¹⁷ = 101220881039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221012091 and 101221012100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221012411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6419265 + ... + 6435013.

It is an arithmetic number, because the mean of its divisors is an integer number (6791951250).

Almost surely, 2^101221012111 is an apocalyptic number.

101221012111 is a deficient number, since it is larger than the sum of its proper divisors (7450207889).

101221012111 is a wasteful number, since it uses less digits than its factorization.

101221012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21018.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 101221012111 its reverse (111210122101), we get a palindrome (212431134212).

The spelling of 101221012111 in words is "one hundred one billion, two hundred twenty-one million, twelve thousand, one hundred eleven".