1420423221 has 48 divisors (see below), whose sum is σ = 2238223104. Its totient is φ = 798852096.

The previous prime is 1420423211. The next prime is 1420423241. The reversal of 1420423221 is 1223240241.

It is not a de Polignac number, because 1420423221 - 2⁵ = 1420423189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420423201) 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, 3870180 + ... + 3870546.

It is an arithmetic number, because the mean of its divisors is an integer number (46629648).

Almost surely, 2^1420423221 is an apocalyptic number.

It is an amenable number.

1420423221 is a deficient number, since it is larger than the sum of its proper divisors (817799883).

1420423221 is a wasteful number, since it uses less digits than its factorization.

1420423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1420423221 is about 37688.5025040794. The cubic root of 1420423221 is about 1124.1025193762.

Adding to 1420423221 its reverse (1223240241), we get a palindrome (2643663462).

The spelling of 1420423221 in words is "one billion, four hundred twenty million, four hundred twenty-three thousand, two hundred twenty-one".