1421503220 has 12 divisors (see below), whose sum is σ = 2985156804. Its totient is φ = 568601280.

The previous prime is 1421503219. The next prime is 1421503243. The reversal of 1421503220 is 223051241.

It can be written as a sum of positive squares in 2 ways, for example, as 185558884 + 1235944336 = 13622^2 + 35156^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 71075161 = 1421503220 / (1 + 4 + 2 + 1 + 5 + 0 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1421503192 and 1421503201.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 35537561 + ... + 35537600.

It is an arithmetic number, because the mean of its divisors is an integer number (248763067).

Almost surely, 2^1421503220 is an apocalyptic number.

1421503220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421503220 is an abundant number, since it is smaller than the sum of its proper divisors (1563653584).

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

1421503220 is a wasteful number, since it uses less digits than its factorization.

1421503220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71075170 (or 71075168 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1421503220 is about 37702.8277454092. The cubic root of 1421503220 is about 1124.3873457619.

Adding to 1421503220 its reverse (223051241), we get a palindrome (1644554461).

The spelling of 1421503220 in words is "one billion, four hundred twenty-one million, five hundred three thousand, two hundred twenty".