1021808426 has 16 divisors (see below), whose sum is σ = 1624199040. Its totient is φ = 480457920.

The previous prime is 1021808413. The next prime is 1021808461. The reversal of 1021808426 is 6248081201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1021808392 and 1021808401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32255 + ... + 55533.

It is an arithmetic number, because the mean of its divisors is an integer number (101512440).

Almost surely, 2^1021808426 is an apocalyptic number.

1021808426 is a deficient number, since it is larger than the sum of its proper divisors (602390614).

1021808426 is a wasteful number, since it uses less digits than its factorization.

1021808426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24589.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1021808426 is about 31965.7383146393. The cubic root of 1021808426 is about 1007.2172611617.

Adding to 1021808426 its reverse (6248081201), we get a palindrome (7269889627).

The spelling of 1021808426 in words is "one billion, twenty-one million, eight hundred eight thousand, four hundred twenty-six".