121756020401 has 2 divisors, whose sum is σ = 121756020402. Its totient is φ = 121756020400.

The previous prime is 121756020371. The next prime is 121756020409. The reversal of 121756020401 is 104020657121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108794425600 + 12961594801 = 329840^2 + 113849^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121756020401 is a prime.

It is not a weakly prime, because it can be changed into another prime (121756020409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60878010200 + 60878010201.

It is an arithmetic number, because the mean of its divisors is an integer number (60878010201).

Almost surely, 2^121756020401 is an apocalyptic number.

It is an amenable number.

121756020401 is a deficient number, since it is larger than the sum of its proper divisors (1).

121756020401 is an equidigital number, since it uses as much as digits as its factorization.

121756020401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 121756020401 its reverse (104020657121), we get a palindrome (225776677522).

The spelling of 121756020401 in words is "one hundred twenty-one billion, seven hundred fifty-six million, twenty thousand, four hundred one".