21975576142 has 16 divisors (see below), whose sum is σ = 36364838832. Its totient is φ = 9895193280.

The previous prime is 21975576131. The next prime is 21975576247. The reversal of 21975576142 is 24167557912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10306428 + ... + 10308559.

It is an arithmetic number, because the mean of its divisors is an integer number (2272802427).

Almost surely, 2^21975576142 is an apocalyptic number.

21975576142 is a deficient number, since it is larger than the sum of its proper divisors (14389262690).

21975576142 is a wasteful number, since it uses less digits than its factorization.

21975576142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20615043.

The product of its digits is 1058400, while the sum is 49.

The spelling of 21975576142 in words is "twenty-one billion, nine hundred seventy-five million, five hundred seventy-six thousand, one hundred forty-two".