421155101344553 has 4 divisors (see below), whose sum is σ = 421155989962500. Its totient is φ = 421154212726608.

The previous prime is 421155101344543. The next prime is 421155101344567. The reversal of 421155101344553 is 355443101551124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163589932291984 + 257565169052569 = 12790228^2 + 16048837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421155101344553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421155101344543) 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, 443597678 + ... + 444546071.

It is an arithmetic number, because the mean of its divisors is an integer number (105288997490625).

Almost surely, 2^{421155101344553} is an apocalyptic number.

It is an amenable number.

421155101344553 is a deficient number, since it is larger than the sum of its proper divisors (888617947).

421155101344553 is an equidigital number, since it uses as much as digits as its factorization.

421155101344553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888617946.

The product of its (nonzero) digits is 720000, while the sum is 44.

Adding to 421155101344553 its reverse (355443101551124), we get a palindrome (776598202895677).

The spelling of 421155101344553 in words is "four hundred twenty-one trillion, one hundred fifty-five billion, one hundred one million, three hundred forty-four thousand, five hundred fifty-three".