21142405422 has 24 divisors (see below), whose sum is σ = 45860457864. Its totient is φ = 7039481904.

The previous prime is 21142405397. The next prime is 21142405481. The reversal of 21142405422 is 22450424112.

It is a happy number.

21142405422 is a `hidden beast` number, since 2 + 114 + 2 + 4 + 0 + 542 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 649213 + ... + 681000.

It is an arithmetic number, because the mean of its divisors is an integer number (1910852411).

Almost surely, 2^21142405422 is an apocalyptic number.

21142405422 is an abundant number, since it is smaller than the sum of its proper divisors (24718052442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142405422 is a wasteful number, since it uses less digits than its factorization.

21142405422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331104 (or 1331101 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 21142405422 its reverse (22450424112), we get a palindrome (43592829534).

The spelling of 21142405422 in words is "twenty-one billion, one hundred forty-two million, four hundred five thousand, four hundred twenty-two".