1021010011949 has 2 divisors, whose sum is σ = 1021010011950. Its totient is φ = 1021010011948.

The previous prime is 1021010011943. The next prime is 1021010012003. The reversal of 1021010011949 is 9491100101201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523152763849 + 497857248100 = 723293^2 + 705590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021010011949 - 2⁴ = 1021010011933 is a prime.

It is a super-2 number, since 2×1021010011949² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021010011943) 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, 510505005974 + 510505005975.

It is an arithmetic number, because the mean of its divisors is an integer number (510505005975).

Almost surely, 2^{1021010011949} is an apocalyptic number.

It is an amenable number.

1021010011949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021010011949 is an equidigital number, since it uses as much as digits as its factorization.

1021010011949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 1021010011949 in words is "one trillion, twenty-one billion, ten million, eleven thousand, nine hundred forty-nine".