21210111201131 has 2 divisors, whose sum is σ = 21210111201132. Its totient is φ = 21210111201130.

The previous prime is 21210111201017. The next prime is 21210111201239. The reversal of 21210111201131 is 13110211101212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210111201131 - 2¹⁴ = 21210111184747 is a prime.

It is a super-2 number, since 2×21210111201131² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21210111101131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605055600565 + 10605055600566.

It is an arithmetic number, because the mean of its divisors is an integer number (10605055600566).

Almost surely, 2^{21210111201131} is an apocalyptic number.

21210111201131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210111201131 is an equidigital number, since it uses as much as digits as its factorization.

21210111201131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21210111201131 its reverse (13110211101212), we get a palindrome (34320322302343).

The spelling of 21210111201131 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, two hundred one thousand, one hundred thirty-one".