21375055037242 has 4 divisors (see below), whose sum is σ = 32062582555866. Its totient is φ = 10687527518620.

The previous prime is 21375055037183. The next prime is 21375055037269. The reversal of 21375055037242 is 24273055057312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11348402450121 + 10026652587121 = 3368739^2 + 3166489^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21375055037192 and 21375055037201.

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 as a sum of consecutive naturals, namely, 5343763759309 + ... + 5343763759312.

Almost surely, 2^{21375055037242} is an apocalyptic number.

21375055037242 is a deficient number, since it is larger than the sum of its proper divisors (10687527518624).

21375055037242 is a wasteful number, since it uses less digits than its factorization.

21375055037242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10687527518623.

The product of its (nonzero) digits is 1764000, while the sum is 46.

The spelling of 21375055037242 in words is "twenty-one trillion, three hundred seventy-five billion, fifty-five million, thirty-seven thousand, two hundred forty-two".