55025205221 has 16 divisors (see below), whose sum is σ = 65653137408. Its totient is φ = 45091134000.

The previous prime is 55025205211. The next prime is 55025205239. The reversal of 55025205221 is 12250252055.

It is a cyclic number.

It is not a de Polignac number, because 55025205221 - 2¹⁴ = 55025188837 is a prime.

It is a super-2 number, since 2×55025205221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55025205211) 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, 238796 + ... + 408746.

It is an arithmetic number, because the mean of its divisors is an integer number (4103321088).

Almost surely, 2^55025205221 is an apocalyptic number.

It is an amenable number.

55025205221 is a deficient number, since it is larger than the sum of its proper divisors (10627932187).

55025205221 is a wasteful number, since it uses less digits than its factorization.

55025205221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171992.

The product of its (nonzero) digits is 10000, while the sum is 29.

Adding to 55025205221 its reverse (12250252055), we get a palindrome (67275457276).

The spelling of 55025205221 in words is "fifty-five billion, twenty-five million, two hundred five thousand, two hundred twenty-one".