1211120120021 has 8 divisors (see below), whose sum is σ = 1387789360320. Its totient is φ = 1035363899808.

The previous prime is 1211120119987. The next prime is 1211120120053. The reversal of 1211120120021 is 1200210211121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211120120021 - 2¹⁴ = 1211120103637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211120119978 and 1211120120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211120170021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228252176 + ... + 228257481.

It is an arithmetic number, because the mean of its divisors is an integer number (173473670040).

Almost surely, 2^{1211120120021} is an apocalyptic number.

It is an amenable number.

1211120120021 is a deficient number, since it is larger than the sum of its proper divisors (176669240299).

1211120120021 is an equidigital number, since it uses as much as digits as its factorization.

1211120120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456510043.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211120120021 its reverse (1200210211121), we get a palindrome (2411330331142).

The spelling of 1211120120021 in words is "one trillion, two hundred eleven billion, one hundred twenty million, one hundred twenty thousand, twenty-one".