1023123312220 has 48 divisors (see below), whose sum is σ = 2278905552000. Its totient is φ = 384750250560.

The previous prime is 1023123312149. The next prime is 1023123312229. The reversal of 1023123312220 is 222133213201.

It is a junction number, because it is equal to n+sod(n) for n = 1023123312191 and 1023123312200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023123312229) 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, 10226670 + ... + 10326229.

It is an arithmetic number, because the mean of its divisors is an integer number (47477199000).

Almost surely, 2^{1023123312220} is an apocalyptic number.

1023123312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023123312220 is an abundant number, since it is smaller than the sum of its proper divisors (1255782239780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1023123312220 is a wasteful number, since it uses less digits than its factorization.

1023123312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20553058 (or 20553056 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1023123312220 its reverse (222133213201), we get a palindrome (1245256525421).

The spelling of 1023123312220 in words is "one trillion, twenty-three billion, one hundred twenty-three million, three hundred twelve thousand, two hundred twenty".