221074621387 has 2 divisors, whose sum is σ = 221074621388. Its totient is φ = 221074621386.

The previous prime is 221074621321. The next prime is 221074621409. The reversal of 221074621387 is 783126470122.

221074621387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221074621387 - 2²⁷ = 220940403659 is a prime.

It is not a weakly prime, because it can be changed into another prime (221074622387) 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, 110537310693 + 110537310694.

It is an arithmetic number, because the mean of its divisors is an integer number (110537310694).

Almost surely, 2^221074621387 is an apocalyptic number.

221074621387 is a deficient number, since it is larger than the sum of its proper divisors (1).

221074621387 is an equidigital number, since it uses as much as digits as its factorization.

221074621387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 221074621387 in words is "two hundred twenty-one billion, seventy-four million, six hundred twenty-one thousand, three hundred eighty-seven".