2101010020021 has 4 divisors (see below), whose sum is σ = 2292010930944. Its totient is φ = 1910009109100.

The previous prime is 2101010020013. The next prime is 2101010020147. The reversal of 2101010020021 is 1200200101012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101010020021 - 2³ = 2101010020013 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 (2101010020621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95500455445 + ... + 95500455466.

It is an arithmetic number, because the mean of its divisors is an integer number (573002732736).

Almost surely, 2^{2101010020021} is an apocalyptic number.

It is an amenable number.

2101010020021 is a deficient number, since it is larger than the sum of its proper divisors (191000910923).

2101010020021 is a wasteful number, since it uses less digits than its factorization.

2101010020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191000910922.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2101010020021 its reverse (1200200101012), we get a palindrome (3301210121033).

The spelling of 2101010020021 in words is "two trillion, one hundred one billion, ten million, twenty thousand, twenty-one".