101111120021 has 4 divisors (see below), whose sum is σ = 101111843532. Its totient is φ = 101110396512.

The previous prime is 101111120017. The next prime is 101111120027. The reversal of 101111120021 is 120021111101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120021111101 = 1811 ⋅66273391.

It can be written as a sum of positive squares in 2 ways, for example, as 33897964996 + 67213155025 = 184114^2 + 259255^2 .

It is a cyclic number.

It is not a de Polignac number, because 101111120021 - 2² = 101111120017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101111119984 and 101111120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101111120027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77870 + ... + 456383.

It is an arithmetic number, because the mean of its divisors is an integer number (25277960883).

Almost surely, 2^101111120021 is an apocalyptic number.

It is an amenable number.

101111120021 is a deficient number, since it is larger than the sum of its proper divisors (723511).

101111120021 is an equidigital number, since it uses as much as digits as its factorization.

101111120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723510.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 101111120021 its reverse (120021111101), we get a palindrome (221132231122).

The spelling of 101111120021 in words is "one hundred one billion, one hundred eleven million, one hundred twenty thousand, twenty-one".