21031005067147 has 2 divisors, whose sum is σ = 21031005067148. Its totient is φ = 21031005067146.

The previous prime is 21031005067123. The next prime is 21031005067181. The reversal of 21031005067147 is 74176050013012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21031005067147 - 2¹⁹ = 21031004542859 is a prime.

It is not a weakly prime, because it can be changed into another prime (21031005067117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515502533573 + 10515502533574.

It is an arithmetic number, because the mean of its divisors is an integer number (10515502533574).

Almost surely, 2^{21031005067147} is an apocalyptic number.

21031005067147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031005067147 is an equidigital number, since it uses as much as digits as its factorization.

21031005067147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 21031005067147 in words is "twenty-one trillion, thirty-one billion, five million, sixty-seven thousand, one hundred forty-seven".