21102121021012 has 12 divisors (see below), whose sum is σ = 36958759567380. Its totient is φ = 10542475430336.

The previous prime is 21102121020991. The next prime is 21102121021057. The reversal of 21102121021012 is 21012012120112.

It can be written as a sum of positive squares in 2 ways, for example, as 17289263377296 + 3812857643716 = 4158036^2 + 1952654^2 .

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, 2146264513 + ... + 2146274344.

It is an arithmetic number, because the mean of its divisors is an integer number (3079896630615).

Almost surely, 2^{21102121021012} is an apocalyptic number.

It is an amenable number.

21102121021012 is a deficient number, since it is larger than the sum of its proper divisors (15856638546368).

21102121021012 is a wasteful number, since it uses less digits than its factorization.

21102121021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292540090 (or 4292540088 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21102121021012 its reverse (21012012120112), we get a palindrome (42114133141124).

The spelling of 21102121021012 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, twenty-one thousand, twelve".