20211231221030 has 32 divisors (see below), whose sum is σ = 37147762188864. Its totient is φ = 7915543451136.

The previous prime is 20211231221017. The next prime is 20211231221033. The reversal of 20211231221030 is 3012213211202.

It is a junction number, because it is equal to n+sod(n) for n = 20211231220993 and 20211231221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211231221033) 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, 100946042 + ... + 101146061.

It is an arithmetic number, because the mean of its divisors is an integer number (1160867568402).

Almost surely, 2^{20211231221030} is an apocalyptic number.

20211231221030 is a deficient number, since it is larger than the sum of its proper divisors (16936530967834).

20211231221030 is a wasteful number, since it uses less digits than its factorization.

20211231221030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202092320.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20211231221030 its reverse (3012213211202), we get a palindrome (23223444432232).

The spelling of 20211231221030 in words is "twenty trillion, two hundred eleven billion, two hundred thirty-one million, two hundred twenty-one thousand, thirty".