112121111621 has 4 divisors (see below), whose sum is σ = 112121838732. Its totient is φ = 112120384512.

The previous prime is 112121111593. The next prime is 112121111623. The reversal of 112121111621 is 126111121211.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 689325025 + 111431786596 = 26255^2 + 333814^2 .

It is a cyclic number.

It is not a de Polignac number, because 112121111621 - 2¹⁴ = 112121095237 is a prime.

It is a super-2 number, since 2×112121111621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 112121111593 and 112121111602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112121111623) 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, 30626 + ... + 474531.

It is an arithmetic number, because the mean of its divisors is an integer number (28030459683).

Almost surely, 2^112121111621 is an apocalyptic number.

It is an amenable number.

112121111621 is a deficient number, since it is larger than the sum of its proper divisors (727111).

112121111621 is an equidigital number, since it uses as much as digits as its factorization.

112121111621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727110.

The product of its digits is 48, while the sum is 20.

Adding to 112121111621 its reverse (126111121211), we get a palindrome (238232232832).

The spelling of 112121111621 in words is "one hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, six hundred twenty-one".