1020121012109 has 16 divisors (see below), whose sum is σ = 1079835162624. Its totient is φ = 961696335600.

The previous prime is 1020121012033. The next prime is 1020121012111. The reversal of 1020121012109 is 9012101210201.

It is a cyclic number.

It is not a de Polignac number, because 1020121012109 - 2¹⁶ = 1020120946573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121012129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4746512 + ... + 4956774.

It is an arithmetic number, because the mean of its divisors is an integer number (67489697664).

Almost surely, 2^{1020121012109} is an apocalyptic number.

It is an amenable number.

1020121012109 is a deficient number, since it is larger than the sum of its proper divisors (59714150515).

1020121012109 is a wasteful number, since it uses less digits than its factorization.

1020121012109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213328.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1020121012109 in words is "one trillion, twenty billion, one hundred twenty-one million, twelve thousand, one hundred nine".