1021221029 has 8 divisors (see below), whose sum is σ = 1060629120. Its totient is φ = 982549696.

The previous prime is 1021220969. The next prime is 1021221041. The reversal of 1021221029 is 9201221201.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021221029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021221029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021226029) 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 7 ways as a sum of consecutive naturals, for example, 181364 + ... + 186909.

It is an arithmetic number, because the mean of its divisors is an integer number (132578640).

Almost surely, 2^1021221029 is an apocalyptic number.

It is an amenable number.

1021221029 is a deficient number, since it is larger than the sum of its proper divisors (39408091).

1021221029 is an equidigital number, since it uses as much as digits as its factorization.

1021221029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368379.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1021221029 is about 31956.5490783971. The cubic root of 1021221029 is about 1007.0242211266.

The spelling of 1021221029 in words is "one billion, twenty-one million, two hundred twenty-one thousand, twenty-nine".