21012210113 has 2 divisors, whose sum is σ = 21012210114. Its totient is φ = 21012210112.

The previous prime is 21012210049. The next prime is 21012210139. The reversal of 21012210113 is 31101221012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14788262449 + 6223947664 = 121607^2 + 78892^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012210113 - 2⁶ = 21012210049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012210013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506105056 + 10506105057.

It is an arithmetic number, because the mean of its divisors is an integer number (10506105057).

Almost surely, 2^21012210113 is an apocalyptic number.

It is an amenable number.

21012210113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012210113 is an equidigital number, since it uses as much as digits as its factorization.

21012210113 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 14.

Adding to 21012210113 its reverse (31101221012), we get a palindrome (52113431125).

The spelling of 21012210113 in words is "twenty-one billion, twelve million, two hundred ten thousand, one hundred thirteen".