221221100022002 has 8 divisors (see below), whose sum is σ = 331840293172956. Its totient is φ = 110607668964352.

The previous prime is 221221100021983. The next prime is 221221100022037. The reversal of 221221100022002 is 200220001122122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 192946240279081 + 28274859742921 = 13890509^2 + 5317411^2 .

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

It is a super-2 number, since 2×221221100022002² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440427343 + ... + 1440580914.

Almost surely, 2^{221221100022002} is an apocalyptic number.

221221100022002 is a deficient number, since it is larger than the sum of its proper divisors (110619193150954).

221221100022002 is a wasteful number, since it uses less digits than its factorization.

221221100022002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881046652.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221221100022002 its reverse (200220001122122), we get a palindrome (421441101144124).

The spelling of 221221100022002 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, twenty-two thousand, two".