21210103123012 has 6 divisors (see below), whose sum is σ = 37117680465278. Its totient is φ = 10605051561504.

The previous prime is 21210103122991. The next prime is 21210103123049. The reversal of 21210103123012 is 21032130101212.

It can be written as a sum of positive squares in only one way, i.e., 17714788703236 + 3495314419776 = 4208894^2 + 1869576^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651262890373 + ... + 2651262890380.

Almost surely, 2^{21210103123012} is an apocalyptic number.

It is an amenable number.

21210103123012 is a deficient number, since it is larger than the sum of its proper divisors (15907577342266).

21210103123012 is a wasteful number, since it uses less digits than its factorization.

21210103123012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302525780757 (or 5302525780755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21210103123012 its reverse (21032130101212), we get a palindrome (42242233224224).

The spelling of 21210103123012 in words is "twenty-one trillion, two hundred ten billion, one hundred three million, one hundred twenty-three thousand, twelve".