1221101219977 has 2 divisors, whose sum is σ = 1221101219978. Its totient is φ = 1221101219976.

The previous prime is 1221101219963. The next prime is 1221101219999. The reversal of 1221101219977 is 7799121011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929583294201 + 291517925776 = 964149^2 + 539924^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221101219977 - 2¹¹ = 1221101217929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221101219677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550609988 + 610550609989.

It is an arithmetic number, because the mean of its divisors is an integer number (610550609989).

Almost surely, 2^{1221101219977} is an apocalyptic number.

It is an amenable number.

1221101219977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101219977 is an equidigital number, since it uses as much as digits as its factorization.

1221101219977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 43.

The spelling of 1221101219977 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred nineteen thousand, nine hundred seventy-seven".