2121121023100 has 72 divisors (see below), whose sum is σ = 4758355602000. Its totient is φ = 820160294400.

The previous prime is 2121121023097. The next prime is 2121121023101. The reversal of 2121121023100 is 13201211212.

It is a super-2 number, since 2×2121121023100² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121023101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1926250 + ... + 2820049.

It is an arithmetic number, because the mean of its divisors is an integer number (66088272250).

Almost surely, 2^{2121121023100} is an apocalyptic number.

2121121023100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121121023100 is an abundant number, since it is smaller than the sum of its proper divisors (2637234578900).

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

2121121023100 is a wasteful number, since it uses less digits than its factorization.

2121121023100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746463 (or 4746456 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2121121023100 its reverse (13201211212), we get a palindrome (2134322234312).

The spelling of 2121121023100 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty-three thousand, one hundred".