55121236 has 12 divisors (see below), whose sum is σ = 96778528. Its totient is φ = 27470232.

The previous prime is 55121233. The next prime is 55121239. The reversal of 55121236 is 63212155.

It is an interprime number because it is at equal distance from previous prime (55121233) and next prime (55121239).

It is a self number, because there is not a number n which added to its sum of digits gives 55121236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21216 + ... + 23671.

Almost surely, 2^55121236 is an apocalyptic number.

It is an amenable number.

55121236 is a deficient number, since it is larger than the sum of its proper divisors (41657292).

55121236 is a wasteful number, since it uses less digits than its factorization.

55121236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45198 (or 45196 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 55121236 is about 7424.3677171864. The cubic root of 55121236 is about 380.5744681322.

The spelling of 55121236 in words is "fifty-five million, one hundred twenty-one thousand, two hundred thirty-six".