21002021021012 has 24 divisors (see below), whose sum is σ = 39463615316160. Its totient is φ = 9744102542720.

The previous prime is 21002021020991. The next prime is 21002021021017. The reversal of 21002021021012 is 21012012020012.

21002021021012 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002021021017) 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, 2175018062 + ... + 2175027717.

It is an arithmetic number, because the mean of its divisors is an integer number (1644317304840).

Almost surely, 2^{21002021021012} is an apocalyptic number.

It is an amenable number.

21002021021012 is a deficient number, since it is larger than the sum of its proper divisors (18461594295148).

21002021021012 is a wasteful number, since it uses less digits than its factorization.

21002021021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350045871 (or 4350045869 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002021021012 its reverse (21012012020012), we get a palindrome (42014033041024).

The spelling of 21002021021012 in words is "twenty-one trillion, two billion, twenty-one million, twenty-one thousand, twelve".