221121202021 has 8 divisors (see below), whose sum is σ = 221481532800. Its totient is φ = 220760947680.

The previous prime is 221121202007. The next prime is 221121202039. The reversal of 221121202021 is 120202121122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221121202021 - 2²³ = 221112813413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221121201986 and 221121202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221124202021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9635641 + ... + 9658561.

It is an arithmetic number, because the mean of its divisors is an integer number (27685191600).

Almost surely, 2^221121202021 is an apocalyptic number.

It is an amenable number.

221121202021 is a deficient number, since it is larger than the sum of its proper divisors (360330779).

221121202021 is a wasteful number, since it uses less digits than its factorization.

221121202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38219.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221121202021 its reverse (120202121122), we get a palindrome (341323323143).

The spelling of 221121202021 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, twenty-one".