421001025 has 12 divisors (see below), whose sum is σ = 696055152. Its totient is φ = 224533840.

The previous prime is 421000991. The next prime is 421001029. The reversal of 421001025 is 520100124.

It is not a de Polignac number, because 421001025 - 2⁷ = 421000897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 421000995 and 421001013.

It is not an unprimeable number, because it can be changed into a prime (421001029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2806599 + ... + 2806748.

It is an arithmetic number, because the mean of its divisors is an integer number (58004596).

Almost surely, 2^421001025 is an apocalyptic number.

It is an amenable number.

421001025 is a deficient number, since it is larger than the sum of its proper divisors (275054127).

421001025 is a wasteful number, since it uses less digits than its factorization.

421001025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5613360 (or 5613355 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 421001025 is about 20518.3095063897. The cubic root of 421001025 is about 749.4817308341.

Adding to 421001025 its reverse (520100124), we get a palindrome (941101149).

Subtracting 421001025 from its reverse (520100124), we obtain a palindrome (99099099).

The spelling of 421001025 in words is "four hundred twenty-one million, one thousand, twenty-five".