55153021 has 16 divisors (see below), whose sum is σ = 69032448. Its totient is φ = 42807600.

The previous prime is 55153009. The next prime is 55153027. The reversal of 55153021 is 12035155.

It is not a de Polignac number, because 55153021 - 2⁵ = 55152989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55152983 and 55153001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55153027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20526 + ... + 23056.

It is an arithmetic number, because the mean of its divisors is an integer number (4314528).

Almost surely, 2^55153021 is an apocalyptic number.

It is an amenable number.

55153021 is a deficient number, since it is larger than the sum of its proper divisors (13879427).

55153021 is a wasteful number, since it uses less digits than its factorization.

55153021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 55153021 is about 7426.5079950135. The cubic root of 55153021 is about 380.6476053112.

Adding to 55153021 its reverse (12035155), we get a palindrome (67188176).

The spelling of 55153021 in words is "fifty-five million, one hundred fifty-three thousand, twenty-one".