611221220101 has 2 divisors, whose sum is σ = 611221220102. Its totient is φ = 611221220100.

The previous prime is 611221220083. The next prime is 611221220131. The reversal of 611221220101 is 101022122116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435303050625 + 175918169476 = 659775^2 + 419426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611221220101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611221220131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305610610050 + 305610610051.

It is an arithmetic number, because the mean of its divisors is an integer number (305610610051).

Almost surely, 2^611221220101 is an apocalyptic number.

It is an amenable number.

611221220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

611221220101 is an equidigital number, since it uses as much as digits as its factorization.

611221220101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 611221220101 its reverse (101022122116), we get a palindrome (712243342217).

The spelling of 611221220101 in words is "six hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, one hundred one".