21103203311012 has 12 divisors (see below), whose sum is σ = 36940265932416. Its totient is φ = 10548841616040.

The previous prime is 21103203310967. The next prime is 21103203311023. The reversal of 21103203311012 is 21011330230112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689992664 + ... + 690023247.

It is an arithmetic number, because the mean of its divisors is an integer number (3078355494368).

Almost surely, 2^{21103203311012} is an apocalyptic number.

It is an amenable number.

21103203311012 is a deficient number, since it is larger than the sum of its proper divisors (15837062621404).

21103203311012 is a wasteful number, since it uses less digits than its factorization.

21103203311012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380019738 (or 1380019736 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21103203311012 its reverse (21011330230112), we get a palindrome (42114533541124).

The spelling of 21103203311012 in words is "twenty-one trillion, one hundred three billion, two hundred three million, three hundred eleven thousand, twelve".