221122020021 has 16 divisors (see below), whose sum is σ = 337032904704. Its totient is φ = 126323540784.

The previous prime is 221122019977. The next prime is 221122020029. The reversal of 221122020021 is 120020221122.

It is not a de Polignac number, because 221122020021 - 2¹⁴ = 221122003637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122020029) 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, 1243845 + ... + 1410458.

It is an arithmetic number, because the mean of its divisors is an integer number (21064556544).

Almost surely, 2^221122020021 is an apocalyptic number.

221122020021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221122020021 is a deficient number, since it is larger than the sum of its proper divisors (115910884683).

221122020021 is a wasteful number, since it uses less digits than its factorization.

221122020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658280.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221122020021 its reverse (120020221122), we get a palindrome (341142241143).

The spelling of 221122020021 in words is "two hundred twenty-one billion, one hundred twenty-two million, twenty thousand, twenty-one".