421020201024 has 126 divisors (see below), whose sum is σ = 1240277847354. Its totient is φ = 136546836480.

The previous prime is 421020201023. The next prime is 421020201127. The reversal of 421020201024 is 420102020124.

421020201024 is a `hidden beast` number, since 421 + 0 + 20 + 201 + 0 + 24 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 220824806400 + 200195394624 = 469920^2 + 447432^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 421020200988 and 421020201006.

It is not an unprimeable number, because it can be changed into a prime (421020201023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 521584 + ... + 1055504.

It is an arithmetic number, because the mean of its divisors is an integer number (9843474979).

Almost surely, 2^421020201024 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 421020201024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (620138923677).

421020201024 is an abundant number, since it is smaller than the sum of its proper divisors (819257646330).

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

421020201024 is a wasteful number, since it uses less digits than its factorization.

421020201024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534013 (or 533963 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 421020201024 its reverse (420102020124), we get a palindrome (841122221148).

The spelling of 421020201024 in words is "four hundred twenty-one billion, twenty million, two hundred one thousand, twenty-four".