21101100002 has 8 divisors (see below), whose sum is σ = 32743086300. Its totient is φ = 10186737904.

The previous prime is 21101099989. The next prime is 21101100061. The reversal of 21101100002 is 20000110112.

It can be written as a sum of positive squares in 2 ways, for example, as 18746812561 + 2354287441 = 136919^2 + 48521^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181905977 + ... + 181906092.

Almost surely, 2^21101100002 is an apocalyptic number.

21101100002 is a deficient number, since it is larger than the sum of its proper divisors (11641986298).

21101100002 is a wasteful number, since it uses less digits than its factorization.

21101100002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363812100.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21101100002 its reverse (20000110112), we get a palindrome (41101210114).

The spelling of 21101100002 in words is "twenty-one billion, one hundred one million, one hundred thousand, two".