1421240220 has 72 divisors (see below), whose sum is σ = 4381802880. Its totient is φ = 372781440.

The previous prime is 1421240213. The next prime is 1421240221. The reversal of 1421240220 is 220421241.

1421240220 is a `hidden beast` number, since 1 + 421 + 24 + 0 + 220 = 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 = 1421240193 and 1421240202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421240221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53740 + ... + 75699.

Almost surely, 2^1421240220 is an apocalyptic number.

1421240220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421240220 is an abundant number, since it is smaller than the sum of its proper divisors (2960562660).

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

1421240220 is a wasteful number, since it uses less digits than its factorization.

1421240220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129515 (or 129510 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1421240220 is about 37699.3397820174. The cubic root of 1421240220 is about 1124.3179984900.

Adding to 1421240220 its reverse (220421241), we get a palindrome (1641661461).

The spelling of 1421240220 in words is "one billion, four hundred twenty-one million, two hundred forty thousand, two hundred twenty".