21203220012 has 96 divisors (see below), whose sum is σ = 59383296000. Its totient is φ = 5817111552.

The previous prime is 21203220011. The next prime is 21203220023. The reversal of 21203220012 is 21002230212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21203219973 and 21203220000.

It is not an unprimeable number, because it can be changed into a prime (21203220011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160012 + ... + 260787.

It is an arithmetic number, because the mean of its divisors is an integer number (618576000).

Almost surely, 2^21203220012 is an apocalyptic number.

It is an amenable number.

21203220012 is an abundant number, since it is smaller than the sum of its proper divisors (38180075988).

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

21203220012 is a wasteful number, since it uses less digits than its factorization.

21203220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420855 (or 420853 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21203220012 its reverse (21002230212), we get a palindrome (42205450224).

The spelling of 21203220012 in words is "twenty-one billion, two hundred three million, two hundred twenty thousand, twelve".