21311222103 has 12 divisors (see below), whose sum is σ = 30785917968. Its totient is φ = 14206077600.

The previous prime is 21311222081. The next prime is 21311222129. The reversal of 21311222103 is 30122211312.

It is not a de Polignac number, because 21311222103 - 2⁶ = 21311222039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311221103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16275 + ... + 207092.

It is an arithmetic number, because the mean of its divisors is an integer number (2565493164).

Almost surely, 2^21311222103 is an apocalyptic number.

21311222103 is a deficient number, since it is larger than the sum of its proper divisors (9474695865).

21311222103 is a wasteful number, since it uses less digits than its factorization.

21311222103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233974 (or 233971 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21311222103 its reverse (30122211312), we get a palindrome (51433433415).

The spelling of 21311222103 in words is "twenty-one billion, three hundred eleven million, two hundred twenty-two thousand, one hundred three".