121972506611 has 2 divisors, whose sum is σ = 121972506612. Its totient is φ = 121972506610.

The previous prime is 121972506527. The next prime is 121972506637. The reversal of 121972506611 is 116605279121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121972506611 - 2¹⁸ = 121972244467 is a prime.

It is not a weakly prime, because it can be changed into another prime (121972502611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60986253305 + 60986253306.

It is an arithmetic number, because the mean of its divisors is an integer number (60986253306).

Almost surely, 2^121972506611 is an apocalyptic number.

121972506611 is a deficient number, since it is larger than the sum of its proper divisors (1).

121972506611 is an equidigital number, since it uses as much as digits as its factorization.

121972506611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 121972506611 in words is "one hundred twenty-one billion, nine hundred seventy-two million, five hundred six thousand, six hundred eleven".