21021202012 has 6 divisors (see below), whose sum is σ = 36787103528. Its totient is φ = 10510601004.

The previous prime is 21021202003. The next prime is 21021202039. The reversal of 21021202012 is 21020212012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021201983 and 21021202001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627650248 + ... + 2627650255.

Almost surely, 2^21021202012 is an apocalyptic number.

It is an amenable number.

21021202012 is a deficient number, since it is larger than the sum of its proper divisors (15765901516).

21021202012 is a wasteful number, since it uses less digits than its factorization.

21021202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255300507 (or 5255300505 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021202012 its reverse (21020212012), we get a palindrome (42041414024).

The spelling of 21021202012 in words is "twenty-one billion, twenty-one million, two hundred two thousand, twelve".