1021020220139 has 2 divisors, whose sum is σ = 1021020220140. Its totient is φ = 1021020220138.

The previous prime is 1021020220117. The next prime is 1021020220189. The reversal of 1021020220139 is 9310220201201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021020220139 - 2⁸ = 1021020219883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021020220189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510110069 + 510510110070.

It is an arithmetic number, because the mean of its divisors is an integer number (510510110070).

Almost surely, 2^{1021020220139} is an apocalyptic number.

1021020220139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020220139 is an equidigital number, since it uses as much as digits as its factorization.

1021020220139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 1021020220139 in words is "one trillion, twenty-one billion, twenty million, two hundred twenty thousand, one hundred thirty-nine".