55611021 has 8 divisors (see below), whose sum is σ = 74213280. Its totient is φ = 37041392.

The previous prime is 55611007. The next prime is 55611041. The reversal of 55611021 is 12011655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55611021 - 2⁶ = 55610957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55611001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3855 + ... + 11228.

It is an arithmetic number, because the mean of its divisors is an integer number (9276660).

Almost surely, 2^55611021 is an apocalyptic number.

It is an amenable number.

55611021 is a deficient number, since it is larger than the sum of its proper divisors (18602259).

55611021 is a wasteful number, since it uses less digits than its factorization.

55611021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16315.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 55611021 is about 7457.2797319130. The cubic root of 55611021 is about 381.6983561169.

Adding to 55611021 its reverse (12011655), we get a palindrome (67622676).

The spelling of 55611021 in words is "fifty-five million, six hundred eleven thousand, twenty-one".