21424750042 has 8 divisors (see below), whose sum is σ = 32146852896. Its totient is φ = 10709132412.

The previous prime is 21424750001. The next prime is 21424750049. The reversal of 21424750042 is 24005742412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21424749986 and 21424750013.

It is not an unprimeable number, because it can be changed into a prime (21424750049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1613038 + ... + 1626265.

It is an arithmetic number, because the mean of its divisors is an integer number (4018356612).

Almost surely, 2^21424750042 is an apocalyptic number.

21424750042 is a deficient number, since it is larger than the sum of its proper divisors (10722102854).

21424750042 is a wasteful number, since it uses less digits than its factorization.

21424750042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242612.

The product of its (nonzero) digits is 17920, while the sum is 31.

The spelling of 21424750042 in words is "twenty-one billion, four hundred twenty-four million, seven hundred fifty thousand, forty-two".