1021422042 has 128 divisors (see below), whose sum is σ = 2463436800. Its totient is φ = 312916032.

The previous prime is 1021422041. The next prime is 1021422089. The reversal of 1021422042 is 2402241201.

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 (1021422041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3883603 + ... + 3883865.

It is an arithmetic number, because the mean of its divisors is an integer number (19245600).

Almost surely, 2^1021422042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021422042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231718400).

1021422042 is an abundant number, since it is smaller than the sum of its proper divisors (1442014758).

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

1021422042 is a wasteful number, since it uses less digits than its factorization.

1021422042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 403 counting only the distinct ones).

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

The square root of 1021422042 is about 31959.6940223150. The cubic root of 1021422042 is about 1007.0902896446.

Adding to 1021422042 its reverse (2402241201), we get a palindrome (3423663243).

The spelling of 1021422042 in words is "one billion, twenty-one million, four hundred twenty-two thousand, forty-two".