2101211101020 has 24 divisors (see below), whose sum is σ = 5883391083024. Its totient is φ = 560322960256.

The previous prime is 2101211101013. The next prime is 2101211101027. The reversal of 2101211101020 is 201011121012.

It is an interprime number because it is at equal distance from previous prime (2101211101013) and next prime (2101211101027).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2101211100987 and 2101211101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101211101027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17510092449 + ... + 17510092568.

It is an arithmetic number, because the mean of its divisors is an integer number (245141295126).

Almost surely, 2^{2101211101020} is an apocalyptic number.

2101211101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101211101020 is an abundant number, since it is smaller than the sum of its proper divisors (3782179982004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101211101020 is a wasteful number, since it uses less digits than its factorization.

2101211101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35020185029 (or 35020185027 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2101211101020 its reverse (201011121012), we get a palindrome (2302222222032).

The spelling of 2101211101020 in words is "two trillion, one hundred one billion, two hundred eleven million, one hundred one thousand, twenty".