221111001002 has 8 divisors (see below), whose sum is σ = 331674747300. Its totient is φ = 110552751904.

The previous prime is 221111000993. The next prime is 221111001011. The reversal of 221111001002 is 200100111122.

It is an interprime number because it is at equal distance from previous prime (221111000993) and next prime (221111001011).

It can be written as a sum of positive squares in 2 ways, for example, as 210450645001 + 10660356001 = 458749^2 + 103249^2 .

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

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, 1272227 + ... + 1435542.

Almost surely, 2^221111001002 is an apocalyptic number.

221111001002 is a deficient number, since it is larger than the sum of its proper divisors (110563746298).

221111001002 is a wasteful number, since it uses less digits than its factorization.

221111001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748600.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221111001002 its reverse (200100111122), we get a palindrome (421211112124).

The spelling of 221111001002 in words is "two hundred twenty-one billion, one hundred eleven million, one thousand, two".