21100220002 has 4 divisors (see below), whose sum is σ = 31650330006. Its totient is φ = 10550110000.

The previous prime is 21100219963. The next prime is 21100220003. The reversal of 21100220002 is 20002200112.

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., 17843349241 + 3256870761 = 133579^2 + 57069^2 .

It is not an unprimeable number, because it can be changed into a prime (21100220003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275054999 + ... + 5275055002.

Almost surely, 2^21100220002 is an apocalyptic number.

21100220002 is a deficient number, since it is larger than the sum of its proper divisors (10550110004).

21100220002 is a wasteful number, since it uses less digits than its factorization.

21100220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550110003.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21100220002 its reverse (20002200112), we get a palindrome (41102420114).

The spelling of 21100220002 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, two".