123221020 has 24 divisors (see below), whose sum is σ = 278669664. Its totient is φ = 45496896.

The previous prime is 123221011. The next prime is 123221027. The reversal of 123221020 is 20122321.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123221027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236704 + ... + 237223.

It is an arithmetic number, because the mean of its divisors is an integer number (11611236).

Almost surely, 2^123221020 is an apocalyptic number.

123221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123221020 is an abundant number, since it is smaller than the sum of its proper divisors (155448644).

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

123221020 is a wasteful number, since it uses less digits than its factorization.

123221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473949 (or 473947 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 123221020 is about 11100.4963852974. The cubic root of 123221020 is about 497.6166843298.

Adding to 123221020 its reverse (20122321), we get a palindrome (143343341).

The spelling of 123221020 in words is "one hundred twenty-three million, two hundred twenty-one thousand, twenty".