421004400125 has 8 divisors (see below), whose sum is σ = 525413491512. Its totient is φ = 336803520000.

The previous prime is 421004400077. The next prime is 421004400209. The reversal of 421004400125 is 521004400124.

It can be written as a sum of positive squares in 4 ways, for example, as 99065044516 + 321939355609 = 314746^2 + 567397^2 .

It is not a de Polignac number, because 421004400125 - 2¹⁴ = 421004383741 is a prime.

It is a super-2 number, since 2×421004400125² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421004400125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1684017476 + ... + 1684017725.

It is an arithmetic number, because the mean of its divisors is an integer number (65676686439).

Almost surely, 2^421004400125 is an apocalyptic number.

It is an amenable number.

421004400125 is a deficient number, since it is larger than the sum of its proper divisors (104409091387).

421004400125 is an equidigital number, since it uses as much as digits as its factorization.

421004400125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368035216 (or 3368035206 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 421004400125 its reverse (521004400124), we get a palindrome (942008800249).

Subtracting 421004400125 from its reverse (521004400124), we obtain a palindrome (99999999999).

The spelling of 421004400125 in words is "four hundred twenty-one billion, four million, four hundred thousand, one hundred twenty-five".