20721102094 has 64 divisors (see below), whose sum is σ = 39951055872. Its totient is φ = 7825708800.

The previous prime is 20721102091. The next prime is 20721102107. The reversal of 20721102094 is 49020112702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20721102091) 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 31 ways as a sum of consecutive naturals, for example, 980847 + ... + 1001749.

It is an arithmetic number, because the mean of its divisors is an integer number (624235248).

Almost surely, 2^20721102094 is an apocalyptic number.

20721102094 is a deficient number, since it is larger than the sum of its proper divisors (19229953778).

20721102094 is a wasteful number, since it uses less digits than its factorization.

20721102094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21121.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 20721102094 its reverse (49020112702), we get a palindrome (69741214796).

The spelling of 20721102094 in words is "twenty billion, seven hundred twenty-one million, one hundred two thousand, ninety-four".