21220122002 has 4 divisors (see below), whose sum is σ = 31830183006. Its totient is φ = 10610061000.

The previous prime is 21220121971. The next prime is 21220122029. The reversal of 21220122002 is 20022102212.

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., 10646318761 + 10573803241 = 103181^2 + 102829^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305030499 + ... + 5305030502.

Almost surely, 2^21220122002 is an apocalyptic number.

21220122002 is a deficient number, since it is larger than the sum of its proper divisors (10610061004).

21220122002 is a wasteful number, since it uses less digits than its factorization.

21220122002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610061003.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21220122002 its reverse (20022102212), we get a palindrome (41242224214).

The spelling of 21220122002 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, two".