1421143220 has 96 divisors (see below), whose sum is σ = 3632428800. Its totient is φ = 455915520.

The previous prime is 1421143211. The next prime is 1421143253. The reversal of 1421143220 is 223411241.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1421143192 and 1421143201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429131 + ... + 432429.

It is an arithmetic number, because the mean of its divisors is an integer number (37837800).

Almost surely, 2^1421143220 is an apocalyptic number.

1421143220 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 1421143220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1816214400).

1421143220 is an abundant number, since it is smaller than the sum of its proper divisors (2211285580).

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

1421143220 is a wasteful number, since it uses less digits than its factorization.

1421143220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513 (or 3511 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1421143220 is about 37698.0532653876. The cubic root of 1421143220 is about 1124.2924195800.

Adding to 1421143220 its reverse (223411241), we get a palindrome (1644554461).

The spelling of 1421143220 in words is "one billion, four hundred twenty-one million, one hundred forty-three thousand, two hundred twenty".