5420821 has 6 divisors (see below), whose sum is σ = 6305910. Its totient is φ = 4646376.

The previous prime is 5420819. The next prime is 5420827. The reversal of 5420821 is 1280245.

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 1768900 = 1911^2 + 1330^2 .

It is not a de Polignac number, because 5420821 - 2¹ = 5420819 is a prime.

It is a Duffinian number.

5420821 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5420792 and 5420801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5420827) 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, 55266 + ... + 55363.

It is an arithmetic number, because the mean of its divisors is an integer number (1050985).

Almost surely, 2^5420821 is an apocalyptic number.

It is an amenable number.

5420821 is a deficient number, since it is larger than the sum of its proper divisors (885089).

5420821 is a wasteful number, since it uses less digits than its factorization.

5420821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110643 (or 110636 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 5420821 is about 2328.2656635358. The cubic root of 5420821 is about 175.6662601943. Note that the first 3 decimals are identical.

It can be divided in two parts, 5420 and 821, that added together give a square (6241 = 79²).

The spelling of 5420821 in words is "five million, four hundred twenty thousand, eight hundred twenty-one".