1021200321 has 8 divisors (see below), whose sum is σ = 1365031744. Its totient is φ = 679084560.

The previous prime is 1021200307. The next prime is 1021200331. The reversal of 1021200321 is 1230021201.

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

It is not a de Polignac number, because 1021200321 - 2⁵ = 1021200289 is a prime.

It is a super-2 number, since 2×1021200321² = 2085700191221006082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021200297 and 1021200306.

It is not an unprimeable number, because it can be changed into a prime (1021200331) 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, 427525 + ... + 429906.

It is an arithmetic number, because the mean of its divisors is an integer number (170628968).

Almost surely, 2^1021200321 is an apocalyptic number.

It is an amenable number.

1021200321 is a deficient number, since it is larger than the sum of its proper divisors (343831423).

1021200321 is an equidigital number, since it uses as much as digits as its factorization.

1021200321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857831.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1021200321 is about 31956.2250743106. The cubic root of 1021200321 is about 1007.0174143734.

Adding to 1021200321 its reverse (1230021201), we get a palindrome (2251221522).

The spelling of 1021200321 in words is "one billion, twenty-one million, two hundred thousand, three hundred twenty-one".