1421020748221 has 4 divisors (see below), whose sum is σ = 1421469447552. Its totient is φ = 1420572048892.

The previous prime is 1421020748219. The next prime is 1421020748249. The reversal of 1421020748221 is 1228470201241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1421020748221 - 2¹ = 1421020748219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421020748621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224344915 + ... + 224351248.

It is an arithmetic number, because the mean of its divisors is an integer number (355367361888).

Almost surely, 2^{1421020748221} is an apocalyptic number.

It is an amenable number.

1421020748221 is a deficient number, since it is larger than the sum of its proper divisors (448699331).

1421020748221 is an equidigital number, since it uses as much as digits as its factorization.

1421020748221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448699330.

The product of its (nonzero) digits is 14336, while the sum is 34.

Adding to 1421020748221 its reverse (1228470201241), we get a palindrome (2649490949462).

The spelling of 1421020748221 in words is "one trillion, four hundred twenty-one billion, twenty million, seven hundred forty-eight thousand, two hundred twenty-one".