20010221010101 has 12 divisors (see below), whose sum is σ = 23447102415948. Its totient is φ = 17026423710912.

The previous prime is 20010221010041. The next prime is 20010221010127. The reversal of 20010221010101 is 10101012201002.

It can be written as a sum of positive squares in 2 ways, for example, as 3989806502500 + 16020414507601 = 1997450^2 + 4002551^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20010221010101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010221010161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1490401526 + ... + 1490414951.

It is an arithmetic number, because the mean of its divisors is an integer number (1953925201329).

Almost surely, 2^{20010221010101} is an apocalyptic number.

It is an amenable number.

20010221010101 is a deficient number, since it is larger than the sum of its proper divisors (3436881405847).

20010221010101 is a wasteful number, since it uses less digits than its factorization.

20010221010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980816628 (or 2980816621 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20010221010101 its reverse (10101012201002), we get a palindrome (30111233211103).

The spelling of 20010221010101 in words is "twenty trillion, ten billion, two hundred twenty-one million, ten thousand, one hundred one".