21002012020112 has 10 divisors (see below), whose sum is σ = 40691398288998. Its totient is φ = 10501006010048.

The previous prime is 21002012020111. The next prime is 21002012020139. The reversal of 21002012020112 is 21102021020012.

It can be written as a sum of positive squares in only one way, i.e., 21000919320976 + 1092699136 = 4582676^2 + 33056^2 .

It is not an unprimeable number, because it can be changed into a prime (21002012020111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656312875613 + ... + 656312875644.

Almost surely, 2^{21002012020112} is an apocalyptic number.

It is an amenable number.

21002012020112 is a deficient number, since it is larger than the sum of its proper divisors (19689386268886).

21002012020112 is a wasteful number, since it uses less digits than its factorization.

21002012020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312625751265 (or 1312625751259 counting only the distinct ones).

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

Adding to 21002012020112 its reverse (21102021020012), we get a palindrome (42104033040124).

The spelling of 21002012020112 in words is "twenty-one trillion, two billion, twelve million, twenty thousand, one hundred twelve".