54221311521 has 128 divisors (see below), whose sum is σ = 96587043840. Its totient is φ = 29721821184.

The previous prime is 54221311493. The next prime is 54221311523. The reversal of 54221311521 is 12511312245.

It is a happy number.

54221311521 is a `hidden beast` number, since 5 + 4 + 2 + 2 + 131 + 1 + 521 = 666.

It is not a de Polignac number, because 54221311521 - 2¹⁹ = 54220787233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (54221311523) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13310341 + ... + 13314413.

It is an arithmetic number, because the mean of its divisors is an integer number (754586280).

Almost surely, 2^54221311521 is an apocalyptic number.

54221311521 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

54221311521 is a deficient number, since it is larger than the sum of its proper divisors (42365732319).

54221311521 is a wasteful number, since it uses less digits than its factorization.

54221311521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232 (or 4226 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 54221311521 its reverse (12511312245), we get a palindrome (66732623766).

The spelling of 54221311521 in words is "fifty-four billion, two hundred twenty-one million, three hundred eleven thousand, five hundred twenty-one".