55533121 has 12 divisors (see below), whose sum is σ = 66685440. Its totient is φ = 46063080.

The previous prime is 55533113. The next prime is 55533131. The reversal of 55533121 is 12133555.

It is not a de Polignac number, because 55533121 - 2³ = 55533113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55533131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16761 + ... + 19798.

It is an arithmetic number, because the mean of its divisors is an integer number (5557120).

Almost surely, 2^55533121 is an apocalyptic number.

It is an amenable number.

55533121 is a deficient number, since it is larger than the sum of its proper divisors (11152319).

55533121 is a wasteful number, since it uses less digits than its factorization.

55533121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36604 (or 36597 counting only the distinct ones).

The product of its digits is 2250, while the sum is 25.

The square root of 55533121 is about 7452.0548172970. The cubic root of 55533121 is about 381.5200449586.

Adding to 55533121 its reverse (12133555), we get a palindrome (67666676).

The spelling of 55533121 in words is "fifty-five million, five hundred thirty-three thousand, one hundred twenty-one".