21406540134122 has 128 divisors (see below), whose sum is σ = 38935514419200. Its totient is φ = 8697358368000.

The previous prime is 21406540133999. The next prime is 21406540134151. The reversal of 21406540134122 is 22143104560412.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2198017529 + ... + 2198027267.

It is an arithmetic number, because the mean of its divisors is an integer number (304183706400).

Almost surely, 2^{21406540134122} is an apocalyptic number.

21406540134122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21406540134122 is a deficient number, since it is larger than the sum of its proper divisors (17528974285078).

21406540134122 is a wasteful number, since it uses less digits than its factorization.

21406540134122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532.

The product of its (nonzero) digits is 46080, while the sum is 35.

Adding to 21406540134122 its reverse (22143104560412), we get a palindrome (43549644694534).

The spelling of 21406540134122 in words is "twenty-one trillion, four hundred six billion, five hundred forty million, one hundred thirty-four thousand, one hundred twenty-two".