21203122311131 has 16 divisors (see below), whose sum is σ = 22409077017600. Its totient is φ = 20006175420000.

The previous prime is 21203122311103. The next prime is 21203122311197. The reversal of 21203122311131 is 13111322130212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21203122311131 - 2⁶ = 21203122311067 is a prime.

It is a super-2 number, since 2×21203122311131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203122311097 and 21203122311106.

It is not an unprimeable number, because it can be changed into a prime (21203122311331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110874326 + ... + 111065396.

It is an arithmetic number, because the mean of its divisors is an integer number (1400567313600).

Almost surely, 2^{21203122311131} is an apocalyptic number.

21203122311131 is a deficient number, since it is larger than the sum of its proper divisors (1205954706469).

21203122311131 is a wasteful number, since it uses less digits than its factorization.

21203122311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214610.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21203122311131 its reverse (13111322130212), we get a palindrome (34314444441343).

The spelling of 21203122311131 in words is "twenty-one trillion, two hundred three billion, one hundred twenty-two million, three hundred eleven thousand, one hundred thirty-one".