21021121220012 has 12 divisors (see below), whose sum is σ = 36787006564056. Its totient is φ = 10510547916000.

The previous prime is 21021121220003. The next prime is 21021121220023. The reversal of 21021121220012 is 21002212112012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1232003 + ... + 6600005.

It is an arithmetic number, because the mean of its divisors is an integer number (3065583880338).

Almost surely, 2^{21021121220012} is an apocalyptic number.

It is an amenable number.

21021121220012 is a deficient number, since it is larger than the sum of its proper divisors (15765885344044).

21021121220012 is a wasteful number, since it uses less digits than its factorization.

21021121220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347008 (or 6347006 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021121220012 its reverse (21002212112012), we get a palindrome (42023333332024).

The spelling of 21021121220012 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, twelve".