421123981980 has 384 divisors, whose sum is σ = 1435820359680. Its totient is φ = 91158036480.

The previous prime is 421123981969. The next prime is 421123981987. The reversal of 421123981980 is 89189321124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421123981987) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11903077 + ... + 11938403.

It is an arithmetic number, because the mean of its divisors is an integer number (3739115520).

Almost surely, 2^421123981980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421123981980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717910179840).

421123981980 is an abundant number, since it is smaller than the sum of its proper divisors (1014696377700).

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

421123981980 is a wasteful number, since it uses less digits than its factorization.

421123981980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35429 (or 35427 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 421123981980 in words is "four hundred twenty-one billion, one hundred twenty-three million, nine hundred eighty-one thousand, nine hundred eighty".