21101142005 has 8 divisors (see below), whose sum is σ = 25337117400. Its totient is φ = 16870415616.

The previous prime is 21101142001. The next prime is 21101142053. The reversal of 21101142005 is 50024110112.

It can be written as a sum of positive squares in 4 ways, for example, as 3224649796 + 17876492209 = 56786^2 + 133703^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21101142005 - 2² = 21101142001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101142001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1303400 + ... + 1319489.

It is an arithmetic number, because the mean of its divisors is an integer number (3167139675).

Almost surely, 2^21101142005 is an apocalyptic number.

It is an amenable number.

21101142005 is a deficient number, since it is larger than the sum of its proper divisors (4235975395).

21101142005 is a wasteful number, since it uses less digits than its factorization.

21101142005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624503.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21101142005 its reverse (50024110112), we get a palindrome (71125252117).

The spelling of 21101142005 in words is "twenty-one billion, one hundred one million, one hundred forty-two thousand, five".