21022131212 has 48 divisors (see below), whose sum is σ = 37562434560. Its totient is φ = 10293024000.

The previous prime is 21022131211. The next prime is 21022131289. The reversal of 21022131212 is 21213122012.

It is not an unprimeable number, because it can be changed into a prime (21022131211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15445412 + ... + 15446772.

It is an arithmetic number, because the mean of its divisors is an integer number (782550720).

Almost surely, 2^21022131212 is an apocalyptic number.

It is an amenable number.

21022131212 is a deficient number, since it is larger than the sum of its proper divisors (16540303348).

21022131212 is a wasteful number, since it uses less digits than its factorization.

21022131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862 (or 1860 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21022131212 its reverse (21213122012), we get a palindrome (42235253224).

The spelling of 21022131212 in words is "twenty-one billion, twenty-two million, one hundred thirty-one thousand, two hundred twelve".