1402021121 has 4 divisors (see below), whose sum is σ = 1404485700. Its totient is φ = 1399556544.

The previous prime is 1402021109. The next prime is 1402021129. The reversal of 1402021121 is 1211202041.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 658640896 + 743380225 = 25664^2 + 27265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1402021121 - 2¹⁸ = 1401758977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1402021096 and 1402021105.

It is not an unprimeable number, because it can be changed into a prime (1402021129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231436 + ... + 1232573.

It is an arithmetic number, because the mean of its divisors is an integer number (351121425).

Almost surely, 2^1402021121 is an apocalyptic number.

It is an amenable number.

1402021121 is a deficient number, since it is larger than the sum of its proper divisors (2464579).

1402021121 is an equidigital number, since it uses as much as digits as its factorization.

1402021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464578.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1402021121 is about 37443.5724924853. The cubic root of 1402021121 is about 1119.2270179256.

Adding to 1402021121 its reverse (1211202041), we get a palindrome (2613223162).

The spelling of 1402021121 in words is "one billion, four hundred two million, twenty-one thousand, one hundred twenty-one".