1403123421 has 16 divisors (see below), whose sum is σ = 2158078464. Its totient is φ = 794290224.

The previous prime is 1403123417. The next prime is 1403123453. The reversal of 1403123421 is 1243213041.

It is not a de Polignac number, because 1403123421 - 2² = 1403123417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1403123401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309975 + ... + 314468.

It is an arithmetic number, because the mean of its divisors is an integer number (134879904).

Almost surely, 2^1403123421 is an apocalyptic number.

It is an amenable number.

1403123421 is a deficient number, since it is larger than the sum of its proper divisors (754955043).

1403123421 is a wasteful number, since it uses less digits than its factorization.

1403123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624560.

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

The square root of 1403123421 is about 37458.2890826583. The cubic root of 1403123421 is about 1119.5202614290.

Adding to 1403123421 its reverse (1243213041), we get a palindrome (2646336462).

The spelling of 1403123421 in words is "one billion, four hundred three million, one hundred twenty-three thousand, four hundred twenty-one".