1021123221321 has 16 divisors (see below), whose sum is σ = 1556057248128. Its totient is φ = 583476499200.

The previous prime is 1021123221311. The next prime is 1021123221323. The reversal of 1021123221321 is 1231223211201.

It is not a de Polignac number, because 1021123221321 - 2¹⁷ = 1021123090249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1021123221323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370950 + ... + 1476431.

It is an arithmetic number, because the mean of its divisors is an integer number (97253578008).

Almost surely, 2^{1021123221321} is an apocalyptic number.

It is an amenable number.

1021123221321 is a deficient number, since it is larger than the sum of its proper divisors (534934026807).

1021123221321 is a wasteful number, since it uses less digits than its factorization.

1021123221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873712.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1021123221321 its reverse (1231223211201), we get a palindrome (2252346432522).

The spelling of 1021123221321 in words is "one trillion, twenty-one billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty-one".