21550331405153 has 4 divisors (see below), whose sum is σ = 21550340695728. Its totient is φ = 21550322114580.

The previous prime is 21550331405149. The next prime is 21550331405221. The reversal of 21550331405153 is 35150413305512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21550331405153 - 2² = 21550331405149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21550331405123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2070038 + ... + 6883728.

It is an arithmetic number, because the mean of its divisors is an integer number (5387585173932).

Almost surely, 2^{21550331405153} is an apocalyptic number.

It is an amenable number.

21550331405153 is a deficient number, since it is larger than the sum of its proper divisors (9290575).

21550331405153 is an equidigital number, since it uses as much as digits as its factorization.

21550331405153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9290574.

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 21550331405153 in words is "twenty-one trillion, five hundred fifty billion, three hundred thirty-one million, four hundred five thousand, one hundred fifty-three".