1403142321 has 16 divisors (see below), whose sum is σ = 2138857344. Its totient is φ = 801519744.

The previous prime is 1403142269. The next prime is 1403142329. The reversal of 1403142321 is 1232413041.

It is not a de Polignac number, because 1403142321 - 2¹¹ = 1403140273 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 not an unprimeable number, because it can be changed into a prime (1403142329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61885 + ... + 81461.

It is an arithmetic number, because the mean of its divisors is an integer number (133678584).

Almost surely, 2^1403142321 is an apocalyptic number.

It is an amenable number.

1403142321 is a deficient number, since it is larger than the sum of its proper divisors (735715023).

1403142321 is a wasteful number, since it uses less digits than its factorization.

1403142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23000.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1403142321 is about 37458.5413624183. The cubic root of 1403142321 is about 1119.5252880331.

Adding to 1403142321 its reverse (1232413041), we get a palindrome (2635555362).

The spelling of 1403142321 in words is "one billion, four hundred three million, one hundred forty-two thousand, three hundred twenty-one".