1212101221011 has 8 divisors (see below), whose sum is σ = 1619005540800. Its totient is φ = 806632190952.

The previous prime is 1212101220977. The next prime is 1212101221129. The reversal of 1212101221011 is 1101221012121.

It is a happy number.

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

It is not a de Polignac number, because 1212101221011 - 2¹⁸ = 1212100958867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212101221211) 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, 358820461 + ... + 358823838.

It is an arithmetic number, because the mean of its divisors is an integer number (202375692600).

Almost surely, 2^{1212101221011} is an apocalyptic number.

1212101221011 is a deficient number, since it is larger than the sum of its proper divisors (406904319789).

1212101221011 is an equidigital number, since it uses as much as digits as its factorization.

1212101221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717644865.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212101221011 its reverse (1101221012121), we get a palindrome (2313322233132).

The spelling of 1212101221011 in words is "one trillion, two hundred twelve billion, one hundred one million, two hundred twenty-one thousand, eleven".