55021607 has 4 divisors (see below), whose sum is σ = 55454976. Its totient is φ = 54588240.

The previous prime is 55021583. The next prime is 55021619. The reversal of 55021607 is 70612055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55021607 - 2¹⁰ = 55020583 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 (55021507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216494 + ... + 216747.

It is an arithmetic number, because the mean of its divisors is an integer number (13863744).

Almost surely, 2^55021607 is an apocalyptic number.

55021607 is a deficient number, since it is larger than the sum of its proper divisors (433369).

55021607 is a wasteful number, since it uses less digits than its factorization.

55021607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433368.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 55021607 is about 7417.6550876945. The cubic root of 55021607 is about 380.3450397948.

The spelling of 55021607 in words is "fifty-five million, twenty-one thousand, six hundred seven".