2021221110021 has 16 divisors (see below), whose sum is σ = 2854075992768. Its totient is φ = 1267956115200.

The previous prime is 2021221110019. The next prime is 2021221110067. The reversal of 2021221110021 is 1200111221202.

It is not a de Polignac number, because 2021221110021 - 2¹ = 2021221110019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021221110421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3828595 + ... + 4324416.

It is an arithmetic number, because the mean of its divisors is an integer number (178379749548).

Almost surely, 2^{2021221110021} is an apocalyptic number.

It is an amenable number.

2021221110021 is a deficient number, since it is larger than the sum of its proper divisors (832854882747).

2021221110021 is a wasteful number, since it uses less digits than its factorization.

2021221110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8157892.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2021221110021 its reverse (1200111221202), we get a palindrome (3221332331223).

The spelling of 2021221110021 in words is "two trillion, twenty-one billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".