21202220002 has 4 divisors (see below), whose sum is σ = 31803330006. Its totient is φ = 10601110000.

The previous prime is 21202219993. The next prime is 21202220009. The reversal of 21202220002 is 20002220212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21201980881 + 239121 = 145609^2 + 489^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21202220009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300554999 + ... + 5300555002.

Almost surely, 2^21202220002 is an apocalyptic number.

21202220002 is a deficient number, since it is larger than the sum of its proper divisors (10601110004).

21202220002 is a wasteful number, since it uses less digits than its factorization.

21202220002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601110003.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21202220002 its reverse (20002220212), we get a palindrome (41204440214).

The spelling of 21202220002 in words is "twenty-one billion, two hundred two million, two hundred twenty thousand, two".