420403121 has 4 divisors (see below), whose sum is σ = 433964544. Its totient is φ = 406841700.

The previous prime is 420403103. The next prime is 420403127. The reversal of 420403121 is 121304024.

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 not a de Polignac number, because 420403121 - 2⁶ = 420403057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420403121.

It is not an unprimeable number, because it can be changed into a prime (420403127) 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, 6780665 + ... + 6780726.

It is an arithmetic number, because the mean of its divisors is an integer number (108491136).

Almost surely, 2^420403121 is an apocalyptic number.

It is an amenable number.

420403121 is a deficient number, since it is larger than the sum of its proper divisors (13561423).

420403121 is a wasteful number, since it uses less digits than its factorization.

420403121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13561422.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 420403121 is about 20503.7343184114. The cubic root of 420403121 is about 749.1267590690.

Adding to 420403121 its reverse (121304024), we get a palindrome (541707145).

The spelling of 420403121 in words is "four hundred twenty million, four hundred three thousand, one hundred twenty-one".