21223401212 has 48 divisors (see below), whose sum is σ = 41045048352. Its totient is φ = 9539819520.

The previous prime is 21223401203. The next prime is 21223401293. The reversal of 21223401212 is 21210432212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1255883 + ... + 1272669.

It is an arithmetic number, because the mean of its divisors is an integer number (855105174).

Almost surely, 2^21223401212 is an apocalyptic number.

It is an amenable number.

21223401212 is a deficient number, since it is larger than the sum of its proper divisors (19821647140).

21223401212 is a wasteful number, since it uses less digits than its factorization.

21223401212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17438 (or 17436 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21223401212 its reverse (21210432212), we get a palindrome (42433833424).

The spelling of 21223401212 in words is "twenty-one billion, two hundred twenty-three million, four hundred one thousand, two hundred twelve".