1021255213 has 8 divisors (see below), whose sum is σ = 1152514080. Its totient is φ = 896399280.

The previous prime is 1021255211. The next prime is 1021255231. The reversal of 1021255213 is 3125521201.

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

It is not a de Polignac number, because 1021255213 - 2¹ = 1021255211 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 (1021255211) 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 7 ways as a sum of consecutive naturals, for example, 1600395 + ... + 1601032.

It is an arithmetic number, because the mean of its divisors is an integer number (144064260).

Almost surely, 2^1021255213 is an apocalyptic number.

It is an amenable number.

1021255213 is a deficient number, since it is larger than the sum of its proper divisors (131258867).

1021255213 is a wasteful number, since it uses less digits than its factorization.

1021255213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3201467.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1021255213 is about 31957.0839251644. The cubic root of 1021255213 is about 1007.0354572616.

Adding to 1021255213 its reverse (3125521201), we get a palindrome (4146776414).

The spelling of 1021255213 in words is "one billion, twenty-one million, two hundred fifty-five thousand, two hundred thirteen".