1209100120010 has 32 divisors (see below), whose sum is σ = 2185872009552. Its totient is φ = 481533882880.

The previous prime is 1209100119919. The next prime is 1209100120031. The reversal of 1209100120010 is 100210019021.

It can be written as a sum of positive squares in 8 ways, for example, as 1146490572049 + 62609547961 = 1070743^2 + 250219^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2914262 + ... + 3303198.

Almost surely, 2^{1209100120010} is an apocalyptic number.

1209100120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1209100120010 is a deficient number, since it is larger than the sum of its proper divisors (976771889542).

1209100120010 is a wasteful number, since it uses less digits than its factorization.

1209100120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390298.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1209100120010 its reverse (100210019021), we get a palindrome (1309310139031).

The spelling of 1209100120010 in words is "one trillion, two hundred nine billion, one hundred million, one hundred twenty thousand, ten".