21221155012147 has 2 divisors, whose sum is σ = 21221155012148. Its totient is φ = 21221155012146.

The previous prime is 21221155012129. The next prime is 21221155012157. The reversal of 21221155012147 is 74121055112212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221155012147 - 2²⁷ = 21221020794419 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221155012157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610577506073 + 10610577506074.

It is an arithmetic number, because the mean of its divisors is an integer number (10610577506074).

Almost surely, 2^{21221155012147} is an apocalyptic number.

21221155012147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221155012147 is an equidigital number, since it uses as much as digits as its factorization.

21221155012147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 34.

The spelling of 21221155012147 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred fifty-five million, twelve thousand, one hundred forty-seven".