21100044701 has 4 divisors (see below), whose sum is σ = 21229492992. Its totient is φ = 20970596412.

The previous prime is 21100044677. The next prime is 21100044767. The reversal of 21100044701 is 10744000112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100044701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100044101) 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 3 ways as a sum of consecutive naturals, for example, 64723901 + ... + 64724226.

It is an arithmetic number, because the mean of its divisors is an integer number (5307373248).

Almost surely, 2^21100044701 is an apocalyptic number.

It is an amenable number.

21100044701 is a deficient number, since it is larger than the sum of its proper divisors (129448291).

21100044701 is a wasteful number, since it uses less digits than its factorization.

21100044701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129448290.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21100044701 its reverse (10744000112), we get a palindrome (31844044813).

The spelling of 21100044701 in words is "twenty-one billion, one hundred million, forty-four thousand, seven hundred one".