55121013 has 8 divisors (see below), whose sum is σ = 81660800. Its totient is φ = 36747324.

The previous prime is 55120999. The next prime is 55121023. The reversal of 55121013 is 31012155.

It is not a de Polignac number, because 55121013 - 2⁵ = 55120981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1020733 + ... + 1020786.

It is an arithmetic number, because the mean of its divisors is an integer number (10207600).

Almost surely, 2^55121013 is an apocalyptic number.

It is an amenable number.

55121013 is a deficient number, since it is larger than the sum of its proper divisors (26539787).

55121013 is a wasteful number, since it uses less digits than its factorization.

55121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041528 (or 2041522 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 55121013 is about 7424.3526990573. The cubic root of 55121013 is about 380.5739549106.

Adding to 55121013 its reverse (31012155), we get a palindrome (86133168).

The spelling of 55121013 in words is "fifty-five million, one hundred twenty-one thousand, thirteen".