21155166044453 has 8 divisors (see below), whose sum is σ = 24177579295872. Its totient is φ = 18132814461456.

The previous prime is 21155166044401. The next prime is 21155166044477. The reversal of 21155166044453 is 35444066155112.

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 21155166044453 - 2²⁴ = 21155149267237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21155166044398 and 21155166044407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155166044653) 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, 14679650 + ... + 16056227.

It is an arithmetic number, because the mean of its divisors is an integer number (3022197411984).

Almost surely, 2^{21155166044453} is an apocalyptic number.

It is an amenable number.

21155166044453 is a deficient number, since it is larger than the sum of its proper divisors (3022413251419).

21155166044453 is an equidigital number, since it uses as much as digits as its factorization.

21155166044453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30834211.

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 21155166044453 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-six million, forty-four thousand, four hundred fifty-three".