21055241975 has 36 divisors (see below), whose sum is σ = 26694507216. Its totient is φ = 16471580160.

The previous prime is 21055241959. The next prime is 21055242011. The reversal of 21055241975 is 57914255012.

It is not a de Polignac number, because 21055241975 - 2⁴ = 21055241959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 78272141 + ... + 78272409.

Almost surely, 2^21055241975 is an apocalyptic number.

21055241975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21055241975 is a deficient number, since it is larger than the sum of its proper divisors (5639265241).

21055241975 is a wasteful number, since it uses less digits than its factorization.

21055241975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 41.

Adding to 21055241975 its reverse (57914255012), we get a palindrome (78969496987).

The spelling of 21055241975 in words is "twenty-one billion, fifty-five million, two hundred forty-one thousand, nine hundred seventy-five".