1221201211051 has 2 divisors, whose sum is σ = 1221201211052. Its totient is φ = 1221201211050.

The previous prime is 1221201211039. The next prime is 1221201211093. The reversal of 1221201211051 is 1501121021221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221201211051 - 2¹¹ = 1221201209003 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221201211151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600605525 + 610600605526.

It is an arithmetic number, because the mean of its divisors is an integer number (610600605526).

Almost surely, 2^{1221201211051} is an apocalyptic number.

1221201211051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201211051 is an equidigital number, since it uses as much as digits as its factorization.

1221201211051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 1221201211051 its reverse (1501121021221), we get a palindrome (2722322232272).

The spelling of 1221201211051 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, fifty-one".