121401012157 has 2 divisors, whose sum is σ = 121401012158. Its totient is φ = 121401012156.

The previous prime is 121401012127. The next prime is 121401012191. The reversal of 121401012157 is 751210104121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116039697316 + 5361314841 = 340646^2 + 73221^2 .

It is a cyclic number.

It is not a de Polignac number, because 121401012157 - 2³¹ = 119253528509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121401012127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60700506078 + 60700506079.

It is an arithmetic number, because the mean of its divisors is an integer number (60700506079).

Almost surely, 2^121401012157 is an apocalyptic number.

It is an amenable number.

121401012157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121401012157 is an equidigital number, since it uses as much as digits as its factorization.

121401012157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 121401012157 its reverse (751210104121), we get a palindrome (872611116278).

The spelling of 121401012157 in words is "one hundred twenty-one billion, four hundred one million, twelve thousand, one hundred fifty-seven".