123213402020 has 12 divisors (see below), whose sum is σ = 258748144284. Its totient is φ = 49285360800.

The previous prime is 123213402017. The next prime is 123213402083. The reversal of 123213402020 is 20204312321.

It can be written as a sum of positive squares in 2 ways, for example, as 14640516004 + 108572886016 = 120998^2 + 329504^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6160670101 = 123213402020 / (1 + 2 + 3 + 2 + 1 + 3 + 4 + 0 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 123213401983 and 123213402001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080335031 + ... + 3080335070.

It is an arithmetic number, because the mean of its divisors is an integer number (21562345357).

Almost surely, 2^123213402020 is an apocalyptic number.

123213402020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123213402020 is an abundant number, since it is smaller than the sum of its proper divisors (135534742264).

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

123213402020 is a wasteful number, since it uses less digits than its factorization.

123213402020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6160670110 (or 6160670108 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 123213402020 its reverse (20204312321), we get a palindrome (143417714341).

The spelling of 123213402020 in words is "one hundred twenty-three billion, two hundred thirteen million, four hundred two thousand, twenty".