2021011210109 has 2 divisors, whose sum is σ = 2021011210110. Its totient is φ = 2021011210108.

The previous prime is 2021011210003. The next prime is 2021011210123. The reversal of 2021011210109 is 9010121101202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677017230009 + 343993980100 = 1294997^2 + 586510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021011210109 - 2³² = 2016716242813 is a prime.

It is a super-2 number, since 2×2021011210109² (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 (2021011210189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505605054 + 1010505605055.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505605055).

Almost surely, 2^{2021011210109} is an apocalyptic number.

It is an amenable number.

2021011210109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021011210109 is an equidigital number, since it uses as much as digits as its factorization.

2021011210109 is an evil number, because the sum of its binary digits is even.

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

The spelling of 2021011210109 in words is "two trillion, twenty-one billion, eleven million, two hundred ten thousand, one hundred nine".