21124153546355 has 4 divisors (see below), whose sum is σ = 25348984255632. Its totient is φ = 16899322837080.

The previous prime is 21124153546333. The next prime is 21124153546393. The reversal of 21124153546355 is 55364535142112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21124153546355 - 2¹² = 21124153542259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112415354631 + ... + 2112415354640.

It is an arithmetic number, because the mean of its divisors is an integer number (6337246063908).

Almost surely, 2^{21124153546355} is an apocalyptic number.

21124153546355 is a deficient number, since it is larger than the sum of its proper divisors (4224830709277).

21124153546355 is an equidigital number, since it uses as much as digits as its factorization.

21124153546355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224830709276.

The product of its digits is 2160000, while the sum is 47.

Adding to 21124153546355 its reverse (55364535142112), we get a palindrome (76488688688467).

The spelling of 21124153546355 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred fifty-three million, five hundred forty-six thousand, three hundred fifty-five".