1021221650 has 24 divisors (see below), whose sum is σ = 1902995760. Its totient is φ = 407730960.

The previous prime is 1021221599. The next prime is 1021221653. The reversal of 1021221650 is 561221201.

It is not an unprimeable number, because it can be changed into a prime (1021221653) 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 11 ways as a sum of consecutive naturals, for example, 8681 + ... + 46019.

It is an arithmetic number, because the mean of its divisors is an integer number (79291490).

Almost surely, 2^1021221650 is an apocalyptic number.

1021221650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021221650 is a deficient number, since it is larger than the sum of its proper divisors (881774110).

1021221650 is a wasteful number, since it uses less digits than its factorization.

1021221650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37898 (or 37893 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1021221650 is about 31956.5587947138. The cubic root of 1021221650 is about 1007.0244252489.

Adding to 1021221650 its reverse (561221201), we get a palindrome (1582442851).

The spelling of 1021221650 in words is "one billion, twenty-one million, two hundred twenty-one thousand, six hundred fifty".