20021021120101 has 24 divisors (see below), whose sum is σ = 20806983267840. Its totient is φ = 19263596113440.

The previous prime is 20021021120099. The next prime is 20021021120117. The reversal of 20021021120101 is 10102112012002.

It is not a de Polignac number, because 20021021120101 - 2¹ = 20021021120099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021120131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281478820 + ... + 281549938.

It is an arithmetic number, because the mean of its divisors is an integer number (866957636160).

Almost surely, 2^{20021021120101} is an apocalyptic number.

It is an amenable number.

20021021120101 is a deficient number, since it is larger than the sum of its proper divisors (785962147739).

20021021120101 is a wasteful number, since it uses less digits than its factorization.

20021021120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72865 (or 72834 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021021120101 its reverse (10102112012002), we get a palindrome (30123133132103).

The spelling of 20021021120101 in words is "twenty trillion, twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred one".