21000211123131 has 8 divisors (see below), whose sum is σ = 31111423886160. Its totient is φ = 14000140748736.

The previous prime is 21000211123117. The next prime is 21000211123181. The reversal of 21000211123131 is 13132111200012.

It is not a de Polignac number, because 21000211123131 - 2²¹ = 21000209025979 is a prime.

It is a super-2 number, since 2×21000211123131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21000211123181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388892798550 + ... + 388892798603.

It is an arithmetic number, because the mean of its divisors is an integer number (3888927985770).

Almost surely, 2^{21000211123131} is an apocalyptic number.

21000211123131 is a deficient number, since it is larger than the sum of its proper divisors (10111212763029).

21000211123131 is an equidigital number, since it uses as much as digits as its factorization.

21000211123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777785597162 (or 777785597156 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21000211123131 its reverse (13132111200012), we get a palindrome (34132322323143).

The spelling of 21000211123131 in words is "twenty-one trillion, two hundred eleven million, one hundred twenty-three thousand, one hundred thirty-one".