56126021 has 6 divisors (see below), whose sum is σ = 65289510. Its totient is φ = 48107976.

The previous prime is 56125963. The next prime is 56126053. The reversal of 56126021 is 12062165.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 25921 = 7490^2 + 161^2 .

It is a de Polignac number, because none of the positive numbers 2^k-56126021 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 (56126071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572666 + ... + 572763.

It is an arithmetic number, because the mean of its divisors is an integer number (10881585).

Almost surely, 2^56126021 is an apocalyptic number.

It is an amenable number.

56126021 is a deficient number, since it is larger than the sum of its proper divisors (9163489).

56126021 is a wasteful number, since it uses less digits than its factorization.

56126021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145443 (or 1145436 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 56126021 is about 7491.7301739985. The cubic root of 56126021 is about 382.8730090474.

Adding to 56126021 its reverse (12062165), we get a palindrome (68188186).

The spelling of 56126021 in words is "fifty-six million, one hundred twenty-six thousand, twenty-one".