21142104355 has 8 divisors (see below), whose sum is σ = 25372671264. Its totient is φ = 16912252800.

The previous prime is 21142104343. The next prime is 21142104359. The reversal of 21142104355 is 55340124112.

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

It is not a de Polignac number, because 21142104355 - 2⁵ = 21142104323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142104359) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 111511 + ... + 233920.

It is an arithmetic number, because the mean of its divisors is an integer number (3171583908).

Almost surely, 2^21142104355 is an apocalyptic number.

21142104355 is a deficient number, since it is larger than the sum of its proper divisors (4230566909).

21142104355 is a wasteful number, since it uses less digits than its factorization.

21142104355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357677.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21142104355 its reverse (55340124112), we get a palindrome (76482228467).

The spelling of 21142104355 in words is "twenty-one billion, one hundred forty-two million, one hundred four thousand, three hundred fifty-five".