55121432 has 32 divisors (see below), whose sum is σ = 113529600. Its totient is φ = 24973344.

The previous prime is 55121419. The next prime is 55121449. The reversal of 55121432 is 23412155.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 55121398 and 55121407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4388 + ... + 11379.

It is an arithmetic number, because the mean of its divisors is an integer number (3547800).

Almost surely, 2^55121432 is an apocalyptic number.

It is an amenable number.

55121432 is an abundant number, since it is smaller than the sum of its proper divisors (58408168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55121432 is a wasteful number, since it uses less digits than its factorization.

55121432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15815 (or 15811 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 55121432 is about 7424.3809169519. The cubic root of 55121432 is about 380.5749192137.

Adding to 55121432 its reverse (23412155), we get a palindrome (78533587).

The spelling of 55121432 in words is "fifty-five million, one hundred twenty-one thousand, four hundred thirty-two".