20968500101 has 4 divisors (see below), whose sum is σ = 20969217900. Its totient is φ = 20967782304.

The previous prime is 20968500097. The next prime is 20968500109. The reversal of 20968500101 is 10100586902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4776192100 + 16192308001 = 69110^2 + 127249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20968500101 - 2² = 20968500097 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 (20968500109) 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, 313136 + ... + 374153.

It is an arithmetic number, because the mean of its divisors is an integer number (5242304475).

Almost surely, 2^20968500101 is an apocalyptic number.

It is an amenable number.

20968500101 is a deficient number, since it is larger than the sum of its proper divisors (717799).

20968500101 is an equidigital number, since it uses as much as digits as its factorization.

20968500101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717798.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 20968500101 in words is "twenty billion, nine hundred sixty-eight million, five hundred thousand, one hundred one".