421215242122151 has 4 divisors (see below), whose sum is σ = 421392446685792. Its totient is φ = 421038037558512.

The previous prime is 421215242122111. The next prime is 421215242122183. The reversal of 421215242122151 is 151221242512124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421215242122151 - 2²⁶ = 421215175013287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421215242122111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88602278255 + ... + 88602283008.

It is an arithmetic number, because the mean of its divisors is an integer number (105348111671448).

Almost surely, 2^{421215242122151} is an apocalyptic number.

421215242122151 is a deficient number, since it is larger than the sum of its proper divisors (177204563641).

421215242122151 is a wasteful number, since it uses less digits than its factorization.

421215242122151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177204563640.

The product of its digits is 25600, while the sum is 35.

Adding to 421215242122151 its reverse (151221242512124), we get a palindrome (572436484634275).

The spelling of 421215242122151 in words is "four hundred twenty-one trillion, two hundred fifteen billion, two hundred forty-two million, one hundred twenty-two thousand, one hundred fifty-one".