55633021 has 8 divisors (see below), whose sum is σ = 58380480. Its totient is φ = 52912992.

The previous prime is 55633009. The next prime is 55633033. The reversal of 55633021 is 12033655.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55633009) and next prime (55633033).

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 55633021 - 2¹⁹ = 55108733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55633001) 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, 2640 + ... + 10873.

It is an arithmetic number, because the mean of its divisors is an integer number (7297560).

Almost surely, 2^55633021 is an apocalyptic number.

It is an amenable number.

55633021 is a deficient number, since it is larger than the sum of its proper divisors (2747459).

55633021 is a wasteful number, since it uses less digits than its factorization.

55633021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13715.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 55633021 is about 7458.7546547664. The cubic root of 55633021 is about 381.7486834116.

Adding to 55633021 its reverse (12033655), we get a palindrome (67666676).

The spelling of 55633021 in words is "fifty-five million, six hundred thirty-three thousand, twenty-one".