21221002012002 has 32 divisors (see below), whose sum is σ = 45718698751488. Its totient is φ = 6527835482496.

The previous prime is 21221002011959. The next prime is 21221002012009. The reversal of 21221002012002 is 20021020012212.

It is not an unprimeable number, because it can be changed into a prime (21221002012009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35190738 + ... + 35788685.

It is an arithmetic number, because the mean of its divisors is an integer number (1428709335984).

Almost surely, 2^{21221002012002} is an apocalyptic number.

21221002012002 is an abundant number, since it is smaller than the sum of its proper divisors (24497696739486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221002012002 is a wasteful number, since it uses less digits than its factorization.

21221002012002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70983274.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21221002012002 its reverse (20021020012212), we get a palindrome (41242022024214).

The spelling of 21221002012002 in words is "twenty-one trillion, two hundred twenty-one billion, two million, twelve thousand, two".