21220101212939 has 2 divisors, whose sum is σ = 21220101212940. Its totient is φ = 21220101212938.

The previous prime is 21220101212911. The next prime is 21220101212971. The reversal of 21220101212939 is 93921210102212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220101212939 - 2⁸ = 21220101212683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220101212899 and 21220101212908.

It is not a weakly prime, because it can be changed into another prime (21220101202939) 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 as a sum of consecutive naturals, namely, 10610050606469 + 10610050606470.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050606470).

Almost surely, 2^{21220101212939} is an apocalyptic number.

21220101212939 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101212939 is an equidigital number, since it uses as much as digits as its factorization.

21220101212939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21220101212939 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, nine hundred thirty-nine".