1021031221 has 16 divisors (see below), whose sum is σ = 1206353920. Its totient is φ = 845659440.

The previous prime is 1021031171. The next prime is 1021031227. The reversal of 1021031221 is 1221301201.

It is a cyclic number.

It is not a de Polignac number, because 1021031221 - 2⁷ = 1021031093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021031227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157180 + ... + 163546.

It is an arithmetic number, because the mean of its divisors is an integer number (75397120).

Almost surely, 2^1021031221 is an apocalyptic number.

It is an amenable number.

1021031221 is a deficient number, since it is larger than the sum of its proper divisors (185322699).

1021031221 is an equidigital number, since it uses as much as digits as its factorization.

1021031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021031221 is about 31953.5791578972. The cubic root of 1021031221 is about 1006.9618274850.

Adding to 1021031221 its reverse (1221301201), we get a palindrome (2242332422).

The spelling of 1021031221 in words is "one billion, twenty-one million, thirty-one thousand, two hundred twenty-one".