421506121 has 4 divisors (see below), whose sum is σ = 426584592. Its totient is φ = 416427652.

The previous prime is 421506037. The next prime is 421506131. The reversal of 421506121 is 121605124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421506121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421506092 and 421506101.

It is not an unprimeable number, because it can be changed into a prime (421506131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2539111 + ... + 2539276.

It is an arithmetic number, because the mean of its divisors is an integer number (106646148).

Almost surely, 2^421506121 is an apocalyptic number.

It is an amenable number.

421506121 is a deficient number, since it is larger than the sum of its proper divisors (5078471).

421506121 is an equidigital number, since it uses as much as digits as its factorization.

421506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5078470.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 421506121 is about 20530.6142382541. The cubic root of 421506121 is about 749.7813412944.

The spelling of 421506121 in words is "four hundred twenty-one million, five hundred six thousand, one hundred twenty-one".