420021021042 has 48 divisors (see below), whose sum is σ = 1040146972800. Its totient is φ = 119995053696.

The previous prime is 420021021037. The next prime is 420021021047. The reversal of 420021021042 is 240120120024.

420021021042 is a `hidden beast` number, since 4 + 200 + 210 + 210 + 42 = 666.

It is an interprime number because it is at equal distance from previous prime (420021021037) and next prime (420021021047).

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

It is not an unprimeable number, because it can be changed into a prime (420021021047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1287834 + ... + 1580682.

It is an arithmetic number, because the mean of its divisors is an integer number (21669728600).

Almost surely, 2^420021021042 is an apocalyptic number.

420021021042 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

420021021042 is an abundant number, since it is smaller than the sum of its proper divisors (620125951758).

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

420021021042 is a wasteful number, since it uses less digits than its factorization.

420021021042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304247 (or 304244 counting only the distinct ones).

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

Adding to 420021021042 its reverse (240120120024), we get a palindrome (660141141066).

The spelling of 420021021042 in words is "four hundred twenty billion, twenty-one million, twenty-one thousand, forty-two".