6420213531 has 12 divisors (see below), whose sum is σ = 9289288008. Its totient is φ = 4272921024.

The previous prime is 6420213511. The next prime is 6420213577. The reversal of 6420213531 is 1353120246.

6420213531 is a `hidden beast` number, since 642 + 0 + 2 + 13 + 5 + 3 + 1 = 666.

It is not a de Polignac number, because 6420213531 - 2¹⁰ = 6420212507 is a prime.

It is a super-2 number, since 2×6420213531² = 82438283567270975922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6420213495 and 6420213504.

It is not an unprimeable number, because it can be changed into a prime (6420213511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 596145 + ... + 606818.

It is an arithmetic number, because the mean of its divisors is an integer number (774107334).

Almost surely, 2^6420213531 is an apocalyptic number.

6420213531 is a deficient number, since it is larger than the sum of its proper divisors (2869074477).

6420213531 is a wasteful number, since it uses less digits than its factorization.

6420213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203562 (or 1203559 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6420213531 is about 80126.2349733219. The cubic root of 6420213531 is about 1858.5881229680.

Adding to 6420213531 its reverse (1353120246), we get a palindrome (7773333777).

The spelling of 6420213531 in words is "six billion, four hundred twenty million, two hundred thirteen thousand, five hundred thirty-one".