1424220021 has 48 divisors (see below), whose sum is σ = 2436455424. Its totient is φ = 784691712.

The previous prime is 1424220013. The next prime is 1424220047. The reversal of 1424220021 is 1200224241.

1424220021 is a `hidden beast` number, since 1 + 424 + 220 + 0 + 21 = 666.

It is not a de Polignac number, because 1424220021 - 2³ = 1424220013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1424219976 and 1424220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1424220121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 260700 + ... + 266106.

It is an arithmetic number, because the mean of its divisors is an integer number (50759488).

Almost surely, 2^1424220021 is an apocalyptic number.

It is an amenable number.

1424220021 is a deficient number, since it is larger than the sum of its proper divisors (1012235403).

1424220021 is a wasteful number, since it uses less digits than its factorization.

1424220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5570 (or 5567 counting only the distinct ones).

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

The square root of 1424220021 is about 37738.8396880455. The cubic root of 1424220021 is about 1125.1032059391.

Adding to 1424220021 its reverse (1200224241), we get a palindrome (2624444262).

It can be divided in two parts, 1424 and 220021, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 1424220021 in words is "one billion, four hundred twenty-four million, two hundred twenty thousand, twenty-one".