21220121112002 has 4 divisors (see below), whose sum is σ = 31830181668006. Its totient is φ = 10610060556000.

The previous prime is 21220121111977. The next prime is 21220121112013. The reversal of 21220121112002 is 20021112102212.

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., 13220721432961 + 7999399679041 = 3636031^2 + 2828321^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305030277999 + ... + 5305030278002.

Almost surely, 2^{21220121112002} is an apocalyptic number.

21220121112002 is a deficient number, since it is larger than the sum of its proper divisors (10610060556004).

21220121112002 is a wasteful number, since it uses less digits than its factorization.

21220121112002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610060556003.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220121112002 its reverse (20021112102212), we get a palindrome (41241233214214).

The spelling of 21220121112002 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, two".