21055131035 has 8 divisors (see below), whose sum is σ = 25320730560. Its totient is φ = 16807722624.

The previous prime is 21055130983. The next prime is 21055131059. The reversal of 21055131035 is 53013155012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21055131035 - 2²⁰ = 21054082459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21055130995 and 21055131013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4545230 + ... + 4549859.

It is an arithmetic number, because the mean of its divisors is an integer number (3165091320).

Almost surely, 2^21055131035 is an apocalyptic number.

21055131035 is a deficient number, since it is larger than the sum of its proper divisors (4265599525).

21055131035 is an equidigital number, since it uses as much as digits as its factorization.

21055131035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9095557.

The product of its (nonzero) digits is 2250, while the sum is 26.

Adding to 21055131035 its reverse (53013155012), we get a palindrome (74068286047).

The spelling of 21055131035 in words is "twenty-one billion, fifty-five million, one hundred thirty-one thousand, thirty-five".