21220121002012 has 48 divisors (see below), whose sum is σ = 37310607566848. Its totient is φ = 10560061419840.

The previous prime is 21220121002009. The next prime is 21220121002019. The reversal of 21220121002012 is 21020012102212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220121002019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2784423562 + ... + 2784431182.

Almost surely, 2^{21220121002012} is an apocalyptic number.

It is an amenable number.

21220121002012 is a deficient number, since it is larger than the sum of its proper divisors (16090486564836).

21220121002012 is a wasteful number, since it uses less digits than its factorization.

21220121002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10946 (or 10944 counting only the distinct ones).

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

Adding to 21220121002012 its reverse (21020012102212), we get a palindrome (42240133104224).

The spelling of 21220121002012 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, twelve".