1021012120005 has 32 divisors (see below), whose sum is σ = 1635990220800. Its totient is φ = 543749965632.

The previous prime is 1021012120003. The next prime is 1021012120069. The reversal of 1021012120005 is 5000212101201.

It is not a de Polignac number, because 1021012120005 - 2¹ = 1021012120003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021012120003) 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 in 31 ways as a sum of consecutive naturals, for example, 42983542 + ... + 43007288.

It is an arithmetic number, because the mean of its divisors is an integer number (51124694400).

Almost surely, 2^{1021012120005} is an apocalyptic number.

1021012120005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021012120005 is a deficient number, since it is larger than the sum of its proper divisors (614978100795).

1021012120005 is a wasteful number, since it uses less digits than its factorization.

1021012120005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27793.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 1021012120005 its reverse (5000212101201), we get a palindrome (6021224221206).

The spelling of 1021012120005 in words is "one trillion, twenty-one billion, twelve million, one hundred twenty thousand, five".