20312310221 has 16 divisors (see below), whose sum is σ = 24440208000. Its totient is φ = 16491273408.

The previous prime is 20312310217. The next prime is 20312310233. The reversal of 20312310221 is 12201321302.

It is a cyclic number.

It is not a de Polignac number, because 20312310221 - 2² = 20312310217 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 20312310221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312310281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1047611 + ... + 1066823.

It is an arithmetic number, because the mean of its divisors is an integer number (1527513000).

Almost surely, 2^20312310221 is an apocalyptic number.

It is an amenable number.

20312310221 is a deficient number, since it is larger than the sum of its proper divisors (4127897779).

20312310221 is a wasteful number, since it uses less digits than its factorization.

20312310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27188.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20312310221 its reverse (12201321302), we get a palindrome (32513631523).

The spelling of 20312310221 in words is "twenty billion, three hundred twelve million, three hundred ten thousand, two hundred twenty-one".