20211231032213 has 4 divisors (see below), whose sum is σ = 21765941111628. Its totient is φ = 18656520952800.

The previous prime is 20211231032191. The next prime is 20211231032231. The reversal of 20211231032213 is 31223013211202.

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 1709171866609 + 18502059165604 = 1307353^2 + 4301402^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211231032213 - 2⁴² = 15813184521109 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 (20211231032233) 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, 777355039688 + ... + 777355039713.

It is an arithmetic number, because the mean of its divisors is an integer number (5441485277907).

Almost surely, 2^{20211231032213} is an apocalyptic number.

It is an amenable number.

20211231032213 is a deficient number, since it is larger than the sum of its proper divisors (1554710079415).

20211231032213 is a wasteful number, since it uses less digits than its factorization.

20211231032213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554710079414.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20211231032213 its reverse (31223013211202), we get a palindrome (51434244243415).

The spelling of 20211231032213 in words is "twenty trillion, two hundred eleven billion, two hundred thirty-one million, thirty-two thousand, two hundred thirteen".