21002120220012 has 48 divisors (see below), whose sum is σ = 49298519501280. Its totient is φ = 6958784762368.

The previous prime is 21002120219989. The next prime is 21002120220013. The reversal of 21002120220012 is 21002202120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002120219973 and 21002120220000.

It is not an unprimeable number, because it can be changed into a prime (21002120220013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8894914 + ... + 11005622.

It is an arithmetic number, because the mean of its divisors is an integer number (1027052489610).

Almost surely, 2^{21002120220012} is an apocalyptic number.

It is an amenable number.

21002120220012 is an abundant number, since it is smaller than the sum of its proper divisors (28296399281268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002120220012 is a wasteful number, since it uses less digits than its factorization.

21002120220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115682 (or 2115680 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002120220012 its reverse (21002202120012), we get a palindrome (42004322340024).

The spelling of 21002120220012 in words is "twenty-one trillion, two billion, one hundred twenty million, two hundred twenty thousand, twelve".