2101211021020 has 12 divisors (see below), whose sum is σ = 4412543144184. Its totient is φ = 840484408400.

The previous prime is 2101211020969. The next prime is 2101211021029. The reversal of 2101211021020 is 201201121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101211021029) 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, 52530275506 + ... + 52530275545.

It is an arithmetic number, because the mean of its divisors is an integer number (367711928682).

Almost surely, 2^{2101211021020} is an apocalyptic number.

2101211021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101211021020 is an abundant number, since it is smaller than the sum of its proper divisors (2311332123164).

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

2101211021020 is a wasteful number, since it uses less digits than its factorization.

2101211021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105060551060 (or 105060551058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2101211021020 its reverse (201201121012), we get a palindrome (2302412142032).

The spelling of 2101211021020 in words is "two trillion, one hundred one billion, two hundred eleven million, twenty-one thousand, twenty".