11211219977 has 2 divisors, whose sum is σ = 11211219978. Its totient is φ = 11211219976.

The previous prime is 11211219931. The next prime is 11211220003. The reversal of 11211219977 is 77991211211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8827729936 + 2383490041 = 93956^2 + 48821^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211219977 - 2⁶ = 11211219913 is a prime.

It is not a weakly prime, because it can be changed into another prime (11211219577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605609988 + 5605609989.

It is an arithmetic number, because the mean of its divisors is an integer number (5605609989).

Almost surely, 2^11211219977 is an apocalyptic number.

It is an amenable number.

11211219977 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211219977 is an equidigital number, since it uses as much as digits as its factorization.

11211219977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 41.

The spelling of 11211219977 in words is "eleven billion, two hundred eleven million, two hundred nineteen thousand, nine hundred seventy-seven".