421415525 has 6 divisors (see below), whose sum is σ = 522555282. Its totient is φ = 337132400.

The previous prime is 421415521. The next prime is 421415543. The reversal of 421415525 is 525514124.

It can be written as a sum of positive squares in 3 ways, for example, as 40424164 + 380991361 = 6358^2 + 19519^2 .

It is not a de Polignac number, because 421415525 - 2² = 421415521 is a prime.

It is a super-2 number, since 2×421415525² = 355182089422051250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421415521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8428286 + ... + 8428335.

It is an arithmetic number, because the mean of its divisors is an integer number (87092547).

Almost surely, 2^421415525 is an apocalyptic number.

It is an amenable number.

421415525 is a deficient number, since it is larger than the sum of its proper divisors (101139757).

421415525 is a wasteful number, since it uses less digits than its factorization.

421415525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16856631 (or 16856626 counting only the distinct ones).

The product of its digits is 8000, while the sum is 29.

The square root of 421415525 is about 20528.4077560828. The cubic root of 421415525 is about 749.7276196091.

Adding to 421415525 its reverse (525514124), we get a palindrome (946929649).

The spelling of 421415525 in words is "four hundred twenty-one million, four hundred fifteen thousand, five hundred twenty-five".