21121200002002 has 16 divisors (see below), whose sum is σ = 32173839965952. Its totient is φ = 10397824516800.

The previous prime is 21121200001987. The next prime is 21121200002009. The reversal of 21121200002002 is 20020000212112.

It is a happy number.

It is a super-2 number, since 2×21121200002002² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121200002009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309424938 + ... + 309493189.

It is an arithmetic number, because the mean of its divisors is an integer number (2010864997872).

Almost surely, 2^{21121200002002} is an apocalyptic number.

21121200002002 is a deficient number, since it is larger than the sum of its proper divisors (11052639963950).

21121200002002 is a wasteful number, since it uses less digits than its factorization.

21121200002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618918393.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21121200002002 its reverse (20020000212112), we get a palindrome (41141200214114).

The spelling of 21121200002002 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred million, two thousand, two".