1021221105 has 8 divisors (see below), whose sum is σ = 1633953792. Its totient is φ = 544651248.

The previous prime is 1021221077. The next prime is 1021221133. The reversal of 1021221105 is 5011221201.

It is an interprime number because it is at equal distance from previous prime (1021221077) and next prime (1021221133).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021221105 - 2⁵ = 1021221073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 68081407 = 1021221105 / (1 + 0 + 2 + 1 + 2 + 2 + 1 + 1 + 0 + 5).

It is a Curzon number.

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, 34040689 + ... + 34040718.

It is an arithmetic number, because the mean of its divisors is an integer number (204244224).

Almost surely, 2^1021221105 is an apocalyptic number.

1021221105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021221105 is a deficient number, since it is larger than the sum of its proper divisors (612732687).

1021221105 is an equidigital number, since it uses as much as digits as its factorization.

1021221105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68081415.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1021221105 is about 31956.5502675117. The cubic root of 1021221105 is about 1007.0242461078.

Adding to 1021221105 its reverse (5011221201), we get a palindrome (6032442306).

The spelling of 1021221105 in words is "one billion, twenty-one million, two hundred twenty-one thousand, one hundred five".