21004155510331 has 8 divisors (see below), whose sum is σ = 24004791628544. Its totient is φ = 18003530010600.

The previous prime is 21004155510311. The next prime is 21004155510337. The reversal of 21004155510331 is 13301555140012.

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 21004155510331 - 2³³ = 20995565575739 is a prime.

It is a super-2 number, since 2×21004155510331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004155510293 and 21004155510302.

It is not an unprimeable number, because it can be changed into a prime (21004155510337) 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, 2168266 + ... + 6834448.

It is an arithmetic number, because the mean of its divisors is an integer number (3000598953568).

Almost surely, 2^{21004155510331} is an apocalyptic number.

21004155510331 is a deficient number, since it is larger than the sum of its proper divisors (3000636118213).

21004155510331 is an equidigital number, since it uses as much as digits as its factorization.

21004155510331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309241.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 21004155510331 in words is "twenty-one trillion, four billion, one hundred fifty-five million, five hundred ten thousand, three hundred thirty-one".