20621621106 has 96 divisors (see below), whose sum is σ = 47067696000. Its totient is φ = 6512596992.

The previous prime is 20621621099. The next prime is 20621621113. The reversal of 20621621106 is 60112612602.

20621621106 is a `hidden beast` number, since 2 + 0 + 6 + 21 + 621 + 10 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (20621621099) and next prime (20621621113).

It is a self number, because there is not a number n which added to its sum of digits gives 20621621106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35739090 + ... + 35739666.

It is an arithmetic number, because the mean of its divisors is an integer number (490288500).

Almost surely, 2^20621621106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20621621106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23533848000).

20621621106 is an abundant number, since it is smaller than the sum of its proper divisors (26446074894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20621621106 is a wasteful number, since it uses less digits than its factorization.

20621621106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 20621621106 in words is "twenty billion, six hundred twenty-one million, six hundred twenty-one thousand, one hundred six".