421011023 has 4 divisors (see below), whose sum is σ = 422158560. Its totient is φ = 419863488.

The previous prime is 421010977. The next prime is 421011053. The reversal of 421011023 is 320110124.

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 421011023 - 2¹⁶ = 420945487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421010989 and 421011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421011053) 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, 573218 + ... + 573951.

It is an arithmetic number, because the mean of its divisors is an integer number (105539640).

Almost surely, 2^421011023 is an apocalyptic number.

421011023 is a deficient number, since it is larger than the sum of its proper divisors (1147537).

421011023 is a wasteful number, since it uses less digits than its factorization.

421011023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147536.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 421011023 is about 20518.5531409990. The cubic root of 421011023 is about 749.4876637247.

Adding to 421011023 its reverse (320110124), we get a palindrome (741121147).

The spelling of 421011023 in words is "four hundred twenty-one million, eleven thousand, twenty-three".