10421525421 has 16 divisors (see below), whose sum is σ = 15462966720. Its totient is φ = 6937032240.

The previous prime is 10421525369. The next prime is 10421525431. The reversal of 10421525421 is 12452512401.

It is a happy number.

10421525421 is a `hidden beast` number, since 1 + 0 + 4 + 215 + 25 + 421 = 666.

It is not a de Polignac number, because 10421525421 - 2⁷ = 10421525293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10421525431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277915 + ... + 313176.

It is an arithmetic number, because the mean of its divisors is an integer number (966435420).

Almost surely, 2^10421525421 is an apocalyptic number.

It is an amenable number.

10421525421 is a deficient number, since it is larger than the sum of its proper divisors (5041441299).

10421525421 is an equidigital number, since it uses as much as digits as its factorization.

10421525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591753 (or 591747 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The spelling of 10421525421 in words is "ten billion, four hundred twenty-one million, five hundred twenty-five thousand, four hundred twenty-one".