1021020220123 has 8 divisors (see below), whose sum is σ = 1057140525056. Its totient is φ = 985098925800.

The previous prime is 1021020220117. The next prime is 1021020220139. The reversal of 1021020220123 is 3210220201201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1021020220123 - 2²⁵ = 1020986665691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021020220097 and 1021020220106.

It is not an unprimeable number, because it can be changed into a prime (1021020220823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49742211 + ... + 49762732.

It is an arithmetic number, because the mean of its divisors is an integer number (132142565632).

Almost surely, 2^{1021020220123} is an apocalyptic number.

1021020220123 is a deficient number, since it is larger than the sum of its proper divisors (36120304933).

1021020220123 is an equidigital number, since it uses as much as digits as its factorization.

1021020220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99505305.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1021020220123 its reverse (3210220201201), we get a palindrome (4231240421324).

The spelling of 1021020220123 in words is "one trillion, twenty-one billion, twenty million, two hundred twenty thousand, one hundred twenty-three".