101561101021 has 16 divisors (see below), whose sum is σ = 108768576384. Its totient is φ = 94493896704.

The previous prime is 101561101013. The next prime is 101561101039. The reversal of 101561101021 is 120101165101.

It is not a de Polignac number, because 101561101021 - 2³ = 101561101013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101561101021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101561101001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 960066 + ... + 1060588.

It is an arithmetic number, because the mean of its divisors is an integer number (6798036024).

Almost surely, 2^101561101021 is an apocalyptic number.

It is an amenable number.

101561101021 is a deficient number, since it is larger than the sum of its proper divisors (7207475363).

101561101021 is a wasteful number, since it uses less digits than its factorization.

101561101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101220.

The product of its (nonzero) digits is 60, while the sum is 19.

Adding to 101561101021 its reverse (120101165101), we get a palindrome (221662266122).

The spelling of 101561101021 in words is "one hundred one billion, five hundred sixty-one million, one hundred one thousand, twenty-one".