421101225 has 18 divisors (see below), whose sum is σ = 754239486. Its totient is φ = 224587200.

The previous prime is 421101221. The next prime is 421101229. The reversal of 421101225 is 522101124.

It is an interprime number because it is at equal distance from previous prime (421101221) and next prime (421101229).

It can be written as a sum of positive squares in 3 ways, for example, as 12616704 + 408484521 = 3552^2 + 20211^2 .

It is not a de Polignac number, because 421101225 - 2² = 421101221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421101198 and 421101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421101221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 935556 + ... + 936005.

Almost surely, 2^421101225 is an apocalyptic number.

421101225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421101225 is a deficient number, since it is larger than the sum of its proper divisors (333138261).

421101225 is a wasteful number, since it uses less digits than its factorization.

421101225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871577 (or 1871569 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 421101225 is about 20520.7510827455. The cubic root of 421101225 is about 749.5411860436.

Adding to 421101225 its reverse (522101124), we get a palindrome (943202349).

The spelling of 421101225 in words is "four hundred twenty-one million, one hundred one thousand, two hundred twenty-five".