1023213221021 has 4 divisors (see below), whose sum is σ = 1023355085052. Its totient is φ = 1023071356992.

The previous prime is 1023213220957. The next prime is 1023213221077. The reversal of 1023213221021 is 1201223123201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 415265536921 + 607947684100 = 644411^2 + 779710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023213221021 - 2⁶ = 1023213220957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023213220984 and 1023213221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023213521021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70921196 + ... + 70935621.

It is an arithmetic number, because the mean of its divisors is an integer number (255838771263).

Almost surely, 2^{1023213221021} is an apocalyptic number.

It is an amenable number.

1023213221021 is a deficient number, since it is larger than the sum of its proper divisors (141864031).

1023213221021 is an equidigital number, since it uses as much as digits as its factorization.

1023213221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141864030.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1023213221021 its reverse (1201223123201), we get a palindrome (2224436344222).

The spelling of 1023213221021 in words is "one trillion, twenty-three billion, two hundred thirteen million, two hundred twenty-one thousand, twenty-one".