1000021842 has 32 divisors (see below), whose sum is σ = 2224200000. Its totient is φ = 333051264.

The previous prime is 1000021823. The next prime is 1000021843. The reversal of 1000021842 is 2481200001.

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 (1000021843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60033 + ... + 74859.

It is an arithmetic number, because the mean of its divisors is an integer number (69506250).

Almost surely, 2^1000021842 is an apocalyptic number.

1000021842 is an abundant number, since it is smaller than the sum of its proper divisors (1224178158).

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

1000021842 is a wasteful number, since it uses less digits than its factorization.

1000021842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16087 (or 16081 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1000021842 is about 31623.1219521413. The cubic root of 1000021842 is about 1000.0072806137.

Adding to 1000021842 its reverse (2481200001), we get a palindrome (3481221843).

The spelling of 1000021842 in words is "one billion, twenty-one thousand, eight hundred forty-two".