20031221211 has 8 divisors (see below), whose sum is σ = 27359716944. Its totient is φ = 13028436480.

The previous prime is 20031221201. The next prime is 20031221233. The reversal of 20031221211 is 11212213002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20031221211 - 2¹³ = 20031213019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20031221201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81427606 + ... + 81427851.

It is an arithmetic number, because the mean of its divisors is an integer number (3419964618).

Almost surely, 2^20031221211 is an apocalyptic number.

20031221211 is a deficient number, since it is larger than the sum of its proper divisors (7328495733).

20031221211 is a wasteful number, since it uses less digits than its factorization.

20031221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162855501.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20031221211 its reverse (11212213002), we get a palindrome (31243434213).

The spelling of 20031221211 in words is "twenty billion, thirty-one million, two hundred twenty-one thousand, two hundred eleven".