20211123312131 has 8 divisors (see below), whose sum is σ = 20299845734064. Its totient is φ = 20122417808640.

The previous prime is 20211123312109. The next prime is 20211123312137. The reversal of 20211123312131 is 13121332111202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211123312131 is a prime.

It is a super-2 number, since 2×20211123312131² (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 = 20211123312097 and 20211123312106.

It is not an unprimeable number, because it can be changed into a prime (20211123312137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1832150 + ... + 6616571.

It is an arithmetic number, because the mean of its divisors is an integer number (2537480716758).

Almost surely, 2^{20211123312131} is an apocalyptic number.

20211123312131 is a deficient number, since it is larger than the sum of its proper divisors (88722421933).

20211123312131 is a wasteful number, since it uses less digits than its factorization.

20211123312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8459221.

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

Adding to 20211123312131 its reverse (13121332111202), we get a palindrome (33332455423333).

The spelling of 20211123312131 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-three million, three hundred twelve thousand, one hundred thirty-one".