221021002102 has 4 divisors (see below), whose sum is σ = 331531503156. Its totient is φ = 110510501050.

The previous prime is 221021002093. The next prime is 221021002117. The reversal of 221021002102 is 201200120122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 201200120122 = 2 ⋅100600060061.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55255250524 + ... + 55255250527.

It is an arithmetic number, because the mean of its divisors is an integer number (82882875789).

Almost surely, 2^221021002102 is an apocalyptic number.

221021002102 is a deficient number, since it is larger than the sum of its proper divisors (110510501054).

221021002102 is a wasteful number, since it uses less digits than its factorization.

221021002102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110510501053.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221021002102 its reverse (201200120122), we get a palindrome (422221122224).

The spelling of 221021002102 in words is "two hundred twenty-one billion, twenty-one million, two thousand, one hundred two".