55030521 has 16 divisors (see below), whose sum is σ = 90306944. Its totient is φ = 29026944.

The previous prime is 55030501. The next prime is 55030523. The reversal of 55030521 is 12503055.

It is not a de Polignac number, because 55030521 - 2⁵ = 55030489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (55030523) 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, 100516 + ... + 101061.

It is an arithmetic number, because the mean of its divisors is an integer number (5644184).

Almost surely, 2^55030521 is an apocalyptic number.

It is an amenable number.

55030521 is a deficient number, since it is larger than the sum of its proper divisors (35276423).

55030521 is a wasteful number, since it uses less digits than its factorization.

55030521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201600.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 55030521 is about 7418.2559271031. The cubic root of 55030521 is about 380.3655784692.

Adding to 55030521 its reverse (12503055), we get a palindrome (67533576).

The spelling of 55030521 in words is "fifty-five million, thirty thousand, five hundred twenty-one".