21021202022012 has 6 divisors (see below), whose sum is σ = 36787103538528. Its totient is φ = 10510601011004.

The previous prime is 21021202022011. The next prime is 21021202022017. The reversal of 21021202022012 is 21022020212012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021202022011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627650252748 + ... + 2627650252755.

It is an arithmetic number, because the mean of its divisors is an integer number (6131183923088).

Almost surely, 2^{21021202022012} is an apocalyptic number.

It is an amenable number.

21021202022012 is a deficient number, since it is larger than the sum of its proper divisors (15765901516516).

21021202022012 is a wasteful number, since it uses less digits than its factorization.

21021202022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255300505507 (or 5255300505505 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21021202022012 its reverse (21022020212012), we get a palindrome (42043222234024).

The spelling of 21021202022012 in words is "twenty-one trillion, twenty-one billion, two hundred two million, twenty-two thousand, twelve".