2121101010100 has 36 divisors (see below), whose sum is σ = 4648361384268. Its totient is φ = 840040000000.

The previous prime is 2121101010059. The next prime is 2121101010103. The reversal of 2121101010100 is 10101011212.

It can be written as a sum of positive squares in 6 ways, for example, as 36738922276 + 2084362087824 = 191674^2 + 1443732^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121101010103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104994901 + ... + 105015100.

It is an arithmetic number, because the mean of its divisors is an integer number (129121149563).

Almost surely, 2^{2121101010100} is an apocalyptic number.

2121101010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121101010100 is an abundant number, since it is smaller than the sum of its proper divisors (2527260374168).

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

2121101010100 is a wasteful number, since it uses less digits than its factorization.

2121101010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210010116 (or 210010109 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 2121101010100 its reverse (10101011212), we get a palindrome (2131202021312).

The spelling of 2121101010100 in words is "two trillion, one hundred twenty-one billion, one hundred one million, ten thousand, one hundred".