21203020210312 has 16 divisors (see below), whose sum is σ = 39756605091840. Its totient is φ = 10601258852496.

The previous prime is 21203020210283. The next prime is 21203020210319. The reversal of 21203020210312 is 21301202030212.

It is a super-2 number, since 2×21203020210312² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21203020210312.

It is not an unprimeable number, because it can be changed into a prime (21203020210319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31047688 + ... + 31723255.

It is an arithmetic number, because the mean of its divisors is an integer number (2484787818240).

Almost surely, 2^{21203020210312} is an apocalyptic number.

It is an amenable number.

21203020210312 is a deficient number, since it is larger than the sum of its proper divisors (18553584881528).

21203020210312 is a wasteful number, since it uses less digits than its factorization.

21203020210312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62813172 (or 62813168 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21203020210312 its reverse (21301202030212), we get a palindrome (42504222240524).

The spelling of 21203020210312 in words is "twenty-one trillion, two hundred three billion, twenty million, two hundred ten thousand, three hundred twelve".