1232121420 has 72 divisors (see below), whose sum is σ = 3747503760. Its totient is φ = 327680640.

The previous prime is 1232121389. The next prime is 1232121421. The reversal of 1232121420 is 241212321.

It is a happy number.

1232121420 is a `hidden beast` number, since 1 + 232 + 12 + 1 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1232121393 and 1232121402.

It is not an unprimeable number, because it can be changed into a prime (1232121421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59190 + ... + 77250.

Almost surely, 2^1232121420 is an apocalyptic number.

1232121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1232121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873751880).

1232121420 is an abundant number, since it is smaller than the sum of its proper divisors (2515382340).

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

1232121420 is a wasteful number, since it uses less digits than its factorization.

1232121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18455 (or 18450 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1232121420 is about 35101.5871436036. The cubic root of 1232121420 is about 1072.0568988047.

Adding to 1232121420 its reverse (241212321), we get a palindrome (1473333741).

Subtracting from 1232121420 its reverse (241212321), we obtain a palindrome (990909099).

The spelling of 1232121420 in words is "one billion, two hundred thirty-two million, one hundred twenty-one thousand, four hundred twenty".