421107615121 has 2 divisors, whose sum is σ = 421107615122. Its totient is φ = 421107615120.

The previous prime is 421107615109. The next prime is 421107615157. The reversal of 421107615121 is 121516701124.

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., 411187455121 + 9920160000 = 641239^2 + 99600^2 .

It is a cyclic number.

It is not a de Polignac number, because 421107615121 - 2¹³ = 421107606929 is a prime.

It is not a weakly prime, because it can be changed into another prime (421107615191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210553807560 + 210553807561.

It is an arithmetic number, because the mean of its divisors is an integer number (210553807561).

Almost surely, 2^421107615121 is an apocalyptic number.

It is an amenable number.

421107615121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421107615121 is an equidigital number, since it uses as much as digits as its factorization.

421107615121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 31.

The spelling of 421107615121 in words is "four hundred twenty-one billion, one hundred seven million, six hundred fifteen thousand, one hundred twenty-one".