21001303021012 has 24 divisors (see below), whose sum is σ = 39028970232000. Its totient is φ = 9859950366336.

The previous prime is 21001303020989. The next prime is 21001303021019. The reversal of 21001303021012 is 21012030310012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001303021019) 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, 1222703512 + ... + 1222720687.

It is an arithmetic number, because the mean of its divisors is an integer number (1626207093000).

Almost surely, 2^{21001303021012} is an apocalyptic number.

It is an amenable number.

21001303021012 is a deficient number, since it is larger than the sum of its proper divisors (18027667210988).

21001303021012 is a wasteful number, since it uses less digits than its factorization.

21001303021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445424335 (or 2445424333 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21001303021012 its reverse (21012030310012), we get a palindrome (42013333331024).

The spelling of 21001303021012 in words is "twenty-one trillion, one billion, three hundred three million, twenty-one thousand, twelve".