20310145436221 has 4 divisors (see below), whose sum is σ = 21379100459200. Its totient is φ = 19241190413244.

The previous prime is 20310145436201. The next prime is 20310145436233. The reversal of 20310145436221 is 12263454101302.

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 not a de Polignac number, because 20310145436221 - 2⁷ = 20310145436093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310145436201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534477511461 + ... + 534477511498.

It is an arithmetic number, because the mean of its divisors is an integer number (5344775114800).

Almost surely, 2^{20310145436221} is an apocalyptic number.

It is an amenable number.

20310145436221 is a deficient number, since it is larger than the sum of its proper divisors (1068955022979).

20310145436221 is a wasteful number, since it uses less digits than its factorization.

20310145436221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068955022978.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 20310145436221 its reverse (12263454101302), we get a palindrome (32573599537523).

The spelling of 20310145436221 in words is "twenty trillion, three hundred ten billion, one hundred forty-five million, four hundred thirty-six thousand, two hundred twenty-one".