55205032421 has 16 divisors (see below), whose sum is σ = 68836884480. Its totient is φ = 43010764080.

The previous prime is 55205032397. The next prime is 55205032453. The reversal of 55205032421 is 12423050255.

It is a cyclic number.

It is not a de Polignac number, because 55205032421 - 2¹⁴ = 55205016037 is a prime.

It is a super-2 number, since 2×55205032421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205032321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534620 + ... + 629466.

It is an arithmetic number, because the mean of its divisors is an integer number (4302305280).

Almost surely, 2^55205032421 is an apocalyptic number.

It is an amenable number.

55205032421 is a deficient number, since it is larger than the sum of its proper divisors (13631852059).

55205032421 is a wasteful number, since it uses less digits than its factorization.

55205032421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102424.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 55205032421 its reverse (12423050255), we get a palindrome (67628082676).

The spelling of 55205032421 in words is "fifty-five billion, two hundred five million, thirty-two thousand, four hundred twenty-one".