221202021021 has 16 divisors (see below), whose sum is σ = 302969350464. Its totient is φ = 143478042624.

The previous prime is 221202020993. The next prime is 221202021031. The reversal of 221202021021 is 120120202122.

It is not a de Polignac number, because 221202021021 - 2²¹ = 221199923869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202021031) 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, 3302926 + ... + 3369231.

It is an arithmetic number, because the mean of its divisors is an integer number (18935584404).

Almost surely, 2^221202021021 is an apocalyptic number.

It is an amenable number.

221202021021 is a deficient number, since it is larger than the sum of its proper divisors (81767329443).

221202021021 is a wasteful number, since it uses less digits than its factorization.

221202021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672460.

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

Adding to 221202021021 its reverse (120120202122), we get a palindrome (341322223143).

The spelling of 221202021021 in words is "two hundred twenty-one billion, two hundred two million, twenty-one thousand, twenty-one".