21201121210012 has 12 divisors (see below), whose sum is σ = 37102022237896. Its totient is φ = 10600543427760.

The previous prime is 21201121209971. The next prime is 21201121210019. The reversal of 21201121210012 is 21001212110212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201121210019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1282539 + ... + 6636802.

Almost surely, 2^{21201121210012} is an apocalyptic number.

It is an amenable number.

21201121210012 is a deficient number, since it is larger than the sum of its proper divisors (15900901027884).

21201121210012 is a wasteful number, since it uses less digits than its factorization.

21201121210012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8588628 (or 8588626 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201121210012 its reverse (21001212110212), we get a palindrome (42202333320224).

The spelling of 21201121210012 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-one million, two hundred ten thousand, twelve".