421123042420 has 24 divisors (see below), whose sum is σ = 887799483144. Its totient is φ = 167793770496.

The previous prime is 421123042399. The next prime is 421123042427. The reversal of 421123042420 is 24240321124.

It can be written as a sum of positive squares in 4 ways, for example, as 261984280336 + 159138762084 = 511844^2 + 398922^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421123042427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40960137 + ... + 40970416.

It is an arithmetic number, because the mean of its divisors is an integer number (36991645131).

Almost surely, 2^421123042420 is an apocalyptic number.

It is an amenable number.

421123042420 is an abundant number, since it is smaller than the sum of its proper divisors (466676440724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421123042420 is a wasteful number, since it uses less digits than its factorization.

421123042420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81930819 (or 81930817 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 421123042420 its reverse (24240321124), we get a palindrome (445363363544).

The spelling of 421123042420 in words is "four hundred twenty-one billion, one hundred twenty-three million, forty-two thousand, four hundred twenty".