1220211101911 has 2 divisors, whose sum is σ = 1220211101912. Its totient is φ = 1220211101910.

The previous prime is 1220211101861. The next prime is 1220211101951. The reversal of 1220211101911 is 1191011120221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220211101911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220211101951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105550955 + 610105550956.

It is an arithmetic number, because the mean of its divisors is an integer number (610105550956).

Almost surely, 2^{1220211101911} is an apocalyptic number.

1220211101911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211101911 is an equidigital number, since it uses as much as digits as its factorization.

1220211101911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 1220211101911 in words is "one trillion, two hundred twenty billion, two hundred eleven million, one hundred one thousand, nine hundred eleven".