221450356513253 has 4 divisors (see below), whose sum is σ = 253086121729440. Its totient is φ = 189814591297068.

The previous prime is 221450356513223. The next prime is 221450356513261. The reversal of 221450356513253 is 352315653054122.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 221450356513253 - 2⁸ = 221450356512997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221450356513198 and 221450356513207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221450356513223) 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, 15817882608083 + ... + 15817882608096.

It is an arithmetic number, because the mean of its divisors is an integer number (63271530432360).

Almost surely, 2^{221450356513253} is an apocalyptic number.

It is an amenable number.

221450356513253 is a deficient number, since it is larger than the sum of its proper divisors (31635765216187).

221450356513253 is an equidigital number, since it uses as much as digits as its factorization.

221450356513253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31635765216186.

The product of its (nonzero) digits is 3240000, while the sum is 47.

The spelling of 221450356513253 in words is "two hundred twenty-one trillion, four hundred fifty billion, three hundred fifty-six million, five hundred thirteen thousand, two hundred fifty-three".