1210123220 has 12 divisors (see below), whose sum is σ = 2541258804. Its totient is φ = 484049280.

The previous prime is 1210123193. The next prime is 1210123259. The reversal of 1210123220 is 223210121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 706390084 + 503733136 = 26578^2 + 22444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1210123195 and 1210123204.

It is a congruent number.

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, 30253061 + ... + 30253100.

It is an arithmetic number, because the mean of its divisors is an integer number (211771567).

Almost surely, 2^1210123220 is an apocalyptic number.

1210123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210123220 is an abundant number, since it is smaller than the sum of its proper divisors (1331135584).

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

1210123220 is a wasteful number, since it uses less digits than its factorization.

1210123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60506170 (or 60506168 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1210123220 is about 34786.8253797325. The cubic root of 1210123220 is about 1065.6384073040.

Adding to 1210123220 its reverse (223210121), we get a palindrome (1433333341).

The spelling of 1210123220 in words is "one billion, two hundred ten million, one hundred twenty-three thousand, two hundred twenty".