55531044121 has 4 divisors (see below), whose sum is σ = 63464050432. Its totient is φ = 47598037812.

The previous prime is 55531044103. The next prime is 55531044137. The reversal of 55531044121 is 12144013555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12144013555 = 5 ⋅2428802711.

It is a cyclic number.

It is not a de Polignac number, because 55531044121 - 2¹⁵ = 55531011353 is a prime.

It is a super-2 number, since 2×55531044121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55531024121) 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, 3966503145 + ... + 3966503158.

It is an arithmetic number, because the mean of its divisors is an integer number (15866012608).

Almost surely, 2^55531044121 is an apocalyptic number.

It is an amenable number.

55531044121 is a deficient number, since it is larger than the sum of its proper divisors (7933006311).

55531044121 is an equidigital number, since it uses as much as digits as its factorization.

55531044121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7933006310.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 55531044121 its reverse (12144013555), we get a palindrome (67675057676).

The spelling of 55531044121 in words is "fifty-five billion, five hundred thirty-one million, forty-four thousand, one hundred twenty-one".