55767021 has 16 divisors (see below), whose sum is σ = 79843968. Its totient is φ = 34496000.

The previous prime is 55766999. The next prime is 55767031. The reversal of 55767021 is 12076755.

Added to its reverse (12076755) it gives a triangular number (67843776 = T₁₁₆₄₈).

It is a cyclic number.

It is not a de Polignac number, because 55767021 - 2⁹ = 55766509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55767031) 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, 4080 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (4990248).

Almost surely, 2^55767021 is an apocalyptic number.

55767021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55767021 is a deficient number, since it is larger than the sum of its proper divisors (24076947).

55767021 is a wasteful number, since it uses less digits than its factorization.

55767021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15492.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 55767021 is about 7467.7319850139. The cubic root of 55767021 is about 382.0549362253.

Adding to 55767021 its reverse (12076755), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 55767021 in words is "fifty-five million, seven hundred sixty-seven thousand, twenty-one".