21403234142 has 16 divisors (see below), whose sum is σ = 32696812512. Its totient is φ = 10505591040.

The previous prime is 21403234123. The next prime is 21403234169. The reversal of 21403234142 is 24143230412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290363 + ... + 356534.

It is an arithmetic number, because the mean of its divisors is an integer number (2043550782).

Almost surely, 2^21403234142 is an apocalyptic number.

21403234142 is a deficient number, since it is larger than the sum of its proper divisors (11293578370).

21403234142 is a wasteful number, since it uses less digits than its factorization.

21403234142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647203.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21403234142 its reverse (24143230412), we get a palindrome (45546464554).

The spelling of 21403234142 in words is "twenty-one billion, four hundred three million, two hundred thirty-four thousand, one hundred forty-two".