21125050455 has 16 divisors (see below), whose sum is σ = 33850023264. Its totient is φ = 11250046080.

The previous prime is 21125050447. The next prime is 21125050481. The reversal of 21125050455 is 55405052112.

It is not a de Polignac number, because 21125050455 - 2³ = 21125050447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1029976 + ... + 1050285.

It is an arithmetic number, because the mean of its divisors is an integer number (2115626454).

Almost surely, 2^21125050455 is an apocalyptic number.

21125050455 is a deficient number, since it is larger than the sum of its proper divisors (12724972809).

21125050455 is a wasteful number, since it uses less digits than its factorization.

21125050455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080946.

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 21125050455 in words is "twenty-one billion, one hundred twenty-five million, fifty thousand, four hundred fifty-five".