54215021 has 6 divisors (see below), whose sum is σ = 63066510. Its totient is φ = 46469976.

The previous prime is 54215011. The next prime is 54215053. The reversal of 54215021 is 12051245.

It can be written as a sum of positive squares in only one way, i.e., 33512521 + 20702500 = 5789^2 + 4550^2 .

It is not a de Polignac number, because 54215021 - 2⁶ = 54214957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 54214984 and 54215002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54215011) 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, 553166 + ... + 553263.

It is an arithmetic number, because the mean of its divisors is an integer number (10511085).

Almost surely, 2^54215021 is an apocalyptic number.

It is an amenable number.

54215021 is a deficient number, since it is larger than the sum of its proper divisors (8851489).

54215021 is a wasteful number, since it uses less digits than its factorization.

54215021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106443 (or 1106436 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 54215021 is about 7363.0850192022. The cubic root of 54215021 is about 378.4773347868.

Adding to 54215021 its reverse (12051245), we get a palindrome (66266266).

The spelling of 54215021 in words is "fifty-four million, two hundred fifteen thousand, twenty-one".