421000121 has 8 divisors (see below), whose sum is σ = 446207904. Its totient is φ = 395841600.

The previous prime is 421000117. The next prime is 421000123. The reversal of 421000121 is 121000124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421000121 - 2² = 421000117 is a prime.

It is a super-2 number, since 2×421000121² = 354482203764029282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421000123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6086 + ... + 29648.

It is an arithmetic number, because the mean of its divisors is an integer number (55775988).

Almost surely, 2^421000121 is an apocalyptic number.

It is an amenable number.

421000121 is a deficient number, since it is larger than the sum of its proper divisors (25207783).

421000121 is a wasteful number, since it uses less digits than its factorization.

421000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24631.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 421000121 is about 20518.2874772726. The cubic root of 421000121 is about 749.4811943889.

Adding to 421000121 its reverse (121000124), we get a palindrome (542000245).

The spelling of 421000121 in words is "four hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.