21200120021002 has 16 divisors (see below), whose sum is σ = 34757487247392. Its totient is φ = 9638630915760.

The previous prime is 21200120020999. The next prime is 21200120021011. The reversal of 21200120021002 is 20012002100212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6084992524 + ... + 6084996007.

It is an arithmetic number, because the mean of its divisors is an integer number (2172342952962).

Almost surely, 2^{21200120021002} is an apocalyptic number.

21200120021002 is a deficient number, since it is larger than the sum of its proper divisors (13557367226390).

21200120021002 is a wasteful number, since it uses less digits than its factorization.

21200120021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12169988613.

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

Adding to 21200120021002 its reverse (20012002100212), we get a palindrome (41212122121214).

The spelling of 21200120021002 in words is "twenty-one trillion, two hundred billion, one hundred twenty million, twenty-one thousand, two".