1421311221 has 48 divisors (see below), whose sum is σ = 2289530880. Its totient is φ = 842434560.

The previous prime is 1421311159. The next prime is 1421311247. The reversal of 1421311221 is 1221131241.

It is not a de Polignac number, because 1421311221 - 2¹⁰ = 1421310197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1421311194 and 1421311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421311271) 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, 853836 + ... + 855498.

It is an arithmetic number, because the mean of its divisors is an integer number (47698560).

Almost surely, 2^1421311221 is an apocalyptic number.

1421311221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1421311221 is a deficient number, since it is larger than the sum of its proper divisors (868219659).

1421311221 is a wasteful number, since it uses less digits than its factorization.

1421311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866 (or 1863 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1421311221 is about 37700.2814445728. The cubic root of 1421311221 is about 1124.3367207233.

Adding to 1421311221 its reverse (1221131241), we get a palindrome (2642442462).

The spelling of 1421311221 in words is "one billion, four hundred twenty-one million, three hundred eleven thousand, two hundred twenty-one".