21021201220012 has 24 divisors (see below), whose sum is σ = 44515484937504. Its totient is φ = 8479139987712.

The previous prime is 21021201220007. The next prime is 21021201220013. The reversal of 21021201220012 is 21002210212012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21021201220013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22081093243 + ... + 22081094194.

It is an arithmetic number, because the mean of its divisors is an integer number (1854811872396).

Almost surely, 2^{21021201220012} is an apocalyptic number.

It is an amenable number.

21021201220012 is an abundant number, since it is smaller than the sum of its proper divisors (23494283717492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021201220012 is a wasteful number, since it uses less digits than its factorization.

21021201220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44162187465 (or 44162187463 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021201220012 its reverse (21002210212012), we get a palindrome (42023411432024).

The spelling of 21021201220012 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two hundred twenty thousand, twelve".