21001002220012 has 24 divisors (see below), whose sum is σ = 38353814021376. Its totient is φ = 10042868637648.

The previous prime is 21001002219997. The next prime is 21001002220021. The reversal of 21001002220012 is 21002220010012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001002219974 and 21001002220001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11520888 + ... + 13218655.

It is an arithmetic number, because the mean of its divisors is an integer number (1598075584224).

Almost surely, 2^{21001002220012} is an apocalyptic number.

It is an amenable number.

21001002220012 is a deficient number, since it is larger than the sum of its proper divisors (17352811801364).

21001002220012 is a wasteful number, since it uses less digits than its factorization.

21001002220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24748797 (or 24748795 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21001002220012 its reverse (21002220010012), we get a palindrome (42003222230024).

The spelling of 21001002220012 in words is "twenty-one trillion, one billion, two million, two hundred twenty thousand, twelve".