55521201 has 16 divisors (see below), whose sum is σ = 80504064. Its totient is φ = 33894144.

The previous prime is 55521197. The next prime is 55521227. The reversal of 55521201 is 10212555.

It is not a de Polignac number, because 55521201 - 2² = 55521197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55521281) 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, 12825 + ... + 16598.

It is an arithmetic number, because the mean of its divisors is an integer number (5031504).

Almost surely, 2^55521201 is an apocalyptic number.

55521201 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55521201 is a deficient number, since it is larger than the sum of its proper divisors (24982863).

55521201 is a wasteful number, since it uses less digits than its factorization.

55521201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29480.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 55521201 is about 7451.2549949656. The cubic root of 55521201 is about 381.4927456684.

Adding to 55521201 its reverse (10212555), we get a palindrome (65733756).

The spelling of 55521201 in words is "fifty-five million, five hundred twenty-one thousand, two hundred one".