42500511212221 has 4 divisors (see below), whose sum is σ = 42501311395452. Its totient is φ = 42499711028992.

The previous prime is 42500511212207. The next prime is 42500511212303. The reversal of 42500511212221 is 12221211500524.

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 18313649508025 + 24186861704196 = 4279445^2 + 4918014^2 .

It is a cyclic number.

It is not a de Polignac number, because 42500511212221 - 2³¹ = 42498363728573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42500511212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42500511212521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400011940 + ... + 400118173.

It is an arithmetic number, because the mean of its divisors is an integer number (10625327848863).

Almost surely, 2^{42500511212221} is an apocalyptic number.

It is an amenable number.

42500511212221 is a deficient number, since it is larger than the sum of its proper divisors (800183231).

42500511212221 is an equidigital number, since it uses as much as digits as its factorization.

42500511212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800183230.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 42500511212221 its reverse (12221211500524), we get a palindrome (54721722712745).

The spelling of 42500511212221 in words is "forty-two trillion, five hundred billion, five hundred eleven million, two hundred twelve thousand, two hundred twenty-one".