2021002101209 has 24 divisors (see below), whose sum is σ = 2531902903488. Its totient is φ = 1598972689440.

The previous prime is 2021002101193. The next prime is 2021002101253. The reversal of 2021002101209 is 9021012001202.

It is a happy number.

It is not a de Polignac number, because 2021002101209 - 2⁴ = 2021002101193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021002101709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23454014 + ... + 23540024.

It is an arithmetic number, because the mean of its divisors is an integer number (105495954312).

Almost surely, 2^{2021002101209} is an apocalyptic number.

It is an amenable number.

2021002101209 is a deficient number, since it is larger than the sum of its proper divisors (510900802279).

2021002101209 is a wasteful number, since it uses less digits than its factorization.

2021002101209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122925 (or 122918 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 2021002101209 in words is "two trillion, twenty-one billion, two million, one hundred one thousand, two hundred nine".