123021420 has 24 divisors (see below), whose sum is σ = 344460144. Its totient is φ = 32805696.

The previous prime is 123021413. The next prime is 123021473. The reversal of 123021420 is 24120321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123021420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025119 + ... + 1025238.

It is an arithmetic number, because the mean of its divisors is an integer number (14352506).

Almost surely, 2^123021420 is an apocalyptic number.

123021420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123021420 is an abundant number, since it is smaller than the sum of its proper divisors (221438724).

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

123021420 is a wasteful number, since it uses less digits than its factorization.

123021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050369 (or 2050367 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 123021420 is about 11091.5021525490. The cubic root of 123021420 is about 497.3478504117.

Adding to 123021420 its reverse (24120321), we get a palindrome (147141741).

The spelling of 123021420 in words is "one hundred twenty-three million, twenty-one thousand, four hundred twenty".