55420213531 has 4 divisors (see below), whose sum is σ = 55421146000. Its totient is φ = 55419281064.

The previous prime is 55420213529. The next prime is 55420213561. The reversal of 55420213531 is 13531202455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13531202455 = 5 ⋅2706240491.

It is a cyclic number.

It is not a de Polignac number, because 55420213531 - 2¹ = 55420213529 is a prime.

It is a super-3 number, since 3×55420213531³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55420213493 and 55420213502.

It is not an unprimeable number, because it can be changed into a prime (55420213501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370536 + ... + 498133.

It is an arithmetic number, because the mean of its divisors is an integer number (13855286500).

Almost surely, 2^55420213531 is an apocalyptic number.

55420213531 is a deficient number, since it is larger than the sum of its proper divisors (932469).

55420213531 is an equidigital number, since it uses as much as digits as its factorization.

55420213531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932468.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 55420213531 its reverse (13531202455), we get a palindrome (68951415986).

The spelling of 55420213531 in words is "fifty-five billion, four hundred twenty million, two hundred thirteen thousand, five hundred thirty-one".