21000221222012 has 6 divisors (see below), whose sum is σ = 36750387138528. Its totient is φ = 10500110611004.

The previous prime is 21000221221979. The next prime is 21000221222033. The reversal of 21000221222012 is 21022212200012.

It is a happy number.

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, 2625027652748 + ... + 2625027652755.

It is an arithmetic number, because the mean of its divisors is an integer number (6125064523088).

Almost surely, 2^{21000221222012} is an apocalyptic number.

It is an amenable number.

21000221222012 is a deficient number, since it is larger than the sum of its proper divisors (15750165916516).

21000221222012 is a wasteful number, since it uses less digits than its factorization.

21000221222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250055305507 (or 5250055305505 counting only the distinct ones).

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

Adding to 21000221222012 its reverse (21022212200012), we get a palindrome (42022433422024).

The spelling of 21000221222012 in words is "twenty-one trillion, two hundred twenty-one million, two hundred twenty-two thousand, twelve".