21022131223312 has 10 divisors (see below), whose sum is σ = 40730379245198. Its totient is φ = 10511065611648.

The previous prime is 21022131223241. The next prime is 21022131223319. The reversal of 21022131223312 is 21332213122012.

It can be written as a sum of positive squares in only one way, i.e., 20090798140176 + 931333083136 = 4482276^2 + 965056^2 .

It is a super-2 number, since 2×21022131223312² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21022131223319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656941600713 + ... + 656941600744.

Almost surely, 2^{21022131223312} is an apocalyptic number.

It is an amenable number.

21022131223312 is a deficient number, since it is larger than the sum of its proper divisors (19708248021886).

21022131223312 is a wasteful number, since it uses less digits than its factorization.

21022131223312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313883201465 (or 1313883201459 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21022131223312 its reverse (21332213122012), we get a palindrome (42354344345324).

The spelling of 21022131223312 in words is "twenty-one trillion, twenty-two billion, one hundred thirty-one million, two hundred twenty-three thousand, three hundred twelve".