55121312 has 24 divisors (see below), whose sum is σ = 108686592. Its totient is φ = 27518400.

The previous prime is 55121273. The next prime is 55121359. The reversal of 55121312 is 21312155.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36737 + ... + 38207.

It is an arithmetic number, because the mean of its divisors is an integer number (4528608).

Almost surely, 2^55121312 is an apocalyptic number.

It is an amenable number.

55121312 is a deficient number, since it is larger than the sum of its proper divisors (53565280).

55121312 is a wasteful number, since it uses less digits than its factorization.

55121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652 (or 2644 counting only the distinct ones).

The product of its digits is 300, while the sum is 20.

The square root of 55121312 is about 7424.3728354656. The cubic root of 55121312 is about 380.5746430415.

Adding to 55121312 its reverse (21312155), we get a palindrome (76433467).

The spelling of 55121312 in words is "fifty-five million, one hundred twenty-one thousand, three hundred twelve".