21223511505355 has 8 divisors (see below), whose sum is σ = 25468251537600. Its totient is φ = 16978784050176.

The previous prime is 21223511505353. The next prime is 21223511505409. The reversal of 21223511505355 is 55350511532212.

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 21223511505355 - 2¹ = 21223511505353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223511505353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085451 + ... + 6604939.

It is an arithmetic number, because the mean of its divisors is an integer number (3183531442200).

Almost surely, 2^{21223511505355} is an apocalyptic number.

21223511505355 is a deficient number, since it is larger than the sum of its proper divisors (4244740032245).

21223511505355 is an equidigital number, since it uses as much as digits as its factorization.

21223511505355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6288533.

The product of its (nonzero) digits is 225000, while the sum is 40.

The spelling of 21223511505355 in words is "twenty-one trillion, two hundred twenty-three billion, five hundred eleven million, five hundred five thousand, three hundred fifty-five".