221101220021 has 16 divisors (see below), whose sum is σ = 241485710400. Its totient is φ = 200764298880.

The previous prime is 221101219987. The next prime is 221101220071. The reversal of 221101220021 is 120022101122.

It is a cyclic number.

It is not a de Polignac number, because 221101220021 - 2⁶ = 221101219957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221101219978 and 221101220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101220071) 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, 60129035 + ... + 60132711.

It is an arithmetic number, because the mean of its divisors is an integer number (15092856900).

Almost surely, 2^221101220021 is an apocalyptic number.

It is an amenable number.

221101220021 is a deficient number, since it is larger than the sum of its proper divisors (20384490379).

221101220021 is a wasteful number, since it uses less digits than its factorization.

221101220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8644.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221101220021 its reverse (120022101122), we get a palindrome (341123321143).

The spelling of 221101220021 in words is "two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, twenty-one".