55012106111621 has 4 divisors (see below), whose sum is σ = 56050070377932. Its totient is φ = 53974141845312.

The previous prime is 55012106111489. The next prime is 55012106111623. The reversal of 55012106111621 is 12611160121055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32776071551521 + 22236034560100 = 5725039^2 + 4715510^2 .

It is a cyclic number.

It is not a de Polignac number, because 55012106111621 - 2¹⁰ = 55012106110597 is a prime.

It is a super-2 number, since 2×55012106111621² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55012106111623) 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, 518982133076 + ... + 518982133181.

It is an arithmetic number, because the mean of its divisors is an integer number (14012517594483).

Almost surely, 2^{55012106111621} is an apocalyptic number.

It is an amenable number.

55012106111621 is a deficient number, since it is larger than the sum of its proper divisors (1037964266311).

55012106111621 is a wasteful number, since it uses less digits than its factorization.

55012106111621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037964266310.

The product of its (nonzero) digits is 3600, while the sum is 32.

Adding to 55012106111621 its reverse (12611160121055), we get a palindrome (67623266232676).

The spelling of 55012106111621 in words is "fifty-five trillion, twelve billion, one hundred six million, one hundred eleven thousand, six hundred twenty-one".