1401321021 has 4 divisors (see below), whose sum is σ = 1868428032. Its totient is φ = 934214012.

The previous prime is 1401320981. The next prime is 1401321029. The reversal of 1401321021 is 1201231041.

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 1401321021 - 2²¹ = 1399223869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401321029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233553501 + ... + 233553506.

It is an arithmetic number, because the mean of its divisors is an integer number (467107008).

Almost surely, 2^1401321021 is an apocalyptic number.

It is an amenable number.

1401321021 is a deficient number, since it is larger than the sum of its proper divisors (467107011).

1401321021 is an equidigital number, since it uses as much as digits as its factorization.

1401321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467107010.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1401321021 is about 37434.2225910997. Note that the first 3 decimals coincide. The cubic root of 1401321021 is about 1119.0406913705.

Adding to 1401321021 its reverse (1201231041), we get a palindrome (2602552062).

The spelling of 1401321021 in words is "one billion, four hundred one million, three hundred twenty-one thousand, twenty-one".