20111230031221 has 4 divisors (see below), whose sum is σ = 22984262892832. Its totient is φ = 17238197169612.

The previous prime is 20111230031197. The next prime is 20111230031303. The reversal of 20111230031221 is 12213003211102.

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 20111230031221 - 2¹³ = 20111230023029 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 (20111230631221) 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, 1436516430795 + ... + 1436516430808.

It is an arithmetic number, because the mean of its divisors is an integer number (5746065723208).

Almost surely, 2^{20111230031221} is an apocalyptic number.

It is an amenable number.

20111230031221 is a deficient number, since it is larger than the sum of its proper divisors (2873032861611).

20111230031221 is an equidigital number, since it uses as much as digits as its factorization.

20111230031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873032861610.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20111230031221 its reverse (12213003211102), we get a palindrome (32324233242323).

The spelling of 20111230031221 in words is "twenty trillion, one hundred eleven billion, two hundred thirty million, thirty-one thousand, two hundred twenty-one".