21012021002012 has 12 divisors (see below), whose sum is σ = 36901894537536. Its totient is φ = 10468622562720.

The previous prime is 21012021001997. The next prime is 21012021002039. The reversal of 21012021002012 is 21020012021012.

It is a congruent number.

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, 9346983308 + ... + 9346985555.

It is an arithmetic number, because the mean of its divisors is an integer number (3075157878128).

Almost surely, 2^{21012021002012} is an apocalyptic number.

It is an amenable number.

21012021002012 is a deficient number, since it is larger than the sum of its proper divisors (15889873535524).

21012021002012 is a wasteful number, since it uses less digits than its factorization.

21012021002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18693969148 (or 18693969146 counting only the distinct ones).

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

Adding to 21012021002012 its reverse (21020012021012), we get a palindrome (42032033023024).

The spelling of 21012021002012 in words is "twenty-one trillion, twelve billion, twenty-one million, two thousand, twelve".