2100121201020 has 96 divisors (see below), whose sum is σ = 6056092224000. Its totient is φ = 543378288384.

The previous prime is 2100121201001. The next prime is 2100121201027. The reversal of 2100121201020 is 201021210012.

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 = 2100121200987 and 2100121201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100121201027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 520570 + ... + 2114529.

It is an arithmetic number, because the mean of its divisors is an integer number (63084294000).

Almost surely, 2^{2100121201020} is an apocalyptic number.

2100121201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100121201020 is an abundant number, since it is smaller than the sum of its proper divisors (3955971022980).

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

2100121201020 is a wasteful number, since it uses less digits than its factorization.

2100121201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635507 (or 2635505 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2100121201020 its reverse (201021210012), we get a palindrome (2301142411032).

The spelling of 2100121201020 in words is "two trillion, one hundred billion, one hundred twenty-one million, two hundred one thousand, twenty".