21103667642 has 8 divisors (see below), whose sum is σ = 31746728736. Its totient is φ = 10521424732.

The previous prime is 21103667617. The next prime is 21103667647. The reversal of 21103667642 is 24676630112.

It is a happy number.

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 = 21103667596 and 21103667605.

It is not an unprimeable number, because it can be changed into a prime (21103667647) 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, 15203678 + ... + 15205065.

It is an arithmetic number, because the mean of its divisors is an integer number (3968341092).

Almost surely, 2^21103667642 is an apocalyptic number.

21103667642 is a deficient number, since it is larger than the sum of its proper divisors (10643061094).

21103667642 is a wasteful number, since it uses less digits than its factorization.

21103667642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30409092.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21103667642 in words is "twenty-one billion, one hundred three million, six hundred sixty-seven thousand, six hundred forty-two".