1221202212411 has 4 divisors (see below), whose sum is σ = 1628269616552. Its totient is φ = 814134808272.

The previous prime is 1221202212341. The next prime is 1221202212449. The reversal of 1221202212411 is 1142122021221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1221202212411 - 2¹⁷ = 1221202081339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221202212011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203533702066 + ... + 203533702071.

It is an arithmetic number, because the mean of its divisors is an integer number (407067404138).

Almost surely, 2^{1221202212411} is an apocalyptic number.

1221202212411 is a deficient number, since it is larger than the sum of its proper divisors (407067404141).

1221202212411 is an equidigital number, since it uses as much as digits as its factorization.

1221202212411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407067404140.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 1221202212411 its reverse (1142122021221), we get a palindrome (2363324233632).

The spelling of 1221202212411 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred twelve thousand, four hundred eleven".