1421521234 has 16 divisors (see below), whose sum is σ = 2437377408. Its totient is φ = 609102432.

The previous prime is 1421521229. The next prime is 1421521237. The reversal of 1421521234 is 4321251241.

It is a junction number, because it is equal to n+sod(n) for n = 1421521199 and 1421521208.

It is not an unprimeable number, because it can be changed into a prime (1421521237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132267 + ... + 142609.

It is an arithmetic number, because the mean of its divisors is an integer number (152336088).

Almost surely, 2^1421521234 is an apocalyptic number.

1421521234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1421521234 is a deficient number, since it is larger than the sum of its proper divisors (1015856174).

1421521234 is a wasteful number, since it uses less digits than its factorization.

1421521234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20169.

The product of its digits is 1920, while the sum is 25.

The square root of 1421521234 is about 37703.0666392006. The cubic root of 1421521234 is about 1124.3920953415.

Adding to 1421521234 its reverse (4321251241), we get a palindrome (5742772475).

The spelling of 1421521234 in words is "one billion, four hundred twenty-one million, five hundred twenty-one thousand, two hundred thirty-four".