21146531232055 has 16 divisors (see below), whose sum is σ = 25408082905920. Its totient is φ = 16895732136192.

The previous prime is 21146531232023. The next prime is 21146531232061. The reversal of 21146531232055 is 55023213564112.

It is a cyclic number.

It is not a de Polignac number, because 21146531232055 - 2⁵ = 21146531232023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21146531231999 and 21146531232017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41866222 + ... + 42368308.

It is an arithmetic number, because the mean of its divisors is an integer number (1588005181620).

Almost surely, 2^{21146531232055} is an apocalyptic number.

21146531232055 is a deficient number, since it is larger than the sum of its proper divisors (4261551673865).

21146531232055 is an equidigital number, since it uses as much as digits as its factorization.

21146531232055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512778.

The product of its (nonzero) digits is 216000, while the sum is 40.

Adding to 21146531232055 its reverse (55023213564112), we get a palindrome (76169744796167).

The spelling of 21146531232055 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty-one million, two hundred thirty-two thousand, fifty-five".