21221002020012 has 24 divisors (see below), whose sum is σ = 50667198622656. Its totient is φ = 6909163448208.

The previous prime is 21221002019999. The next prime is 21221002020013. The reversal of 21221002020012 is 21002020012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221002019973 and 21221002020000.

It is not an unprimeable number, because it can be changed into a prime (21221002020013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20562985938 + ... + 20562986969.

It is an arithmetic number, because the mean of its divisors is an integer number (2111133275944).

Almost surely, 2^{21221002020012} is an apocalyptic number.

It is an amenable number.

21221002020012 is an abundant number, since it is smaller than the sum of its proper divisors (29446196602644).

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

21221002020012 is a wasteful number, since it uses less digits than its factorization.

21221002020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41125972957 (or 41125972955 counting only the distinct ones).

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

Adding to 21221002020012 its reverse (21002020012212), we get a palindrome (42223022032224).

It can be divided in two parts, 212 and 21002020012, that multiplied together give a palindrome (4452428242544).

The spelling of 21221002020012 in words is "twenty-one trillion, two hundred twenty-one billion, two million, twenty thousand, twelve".