20001221002010 has 64 divisors (see below), whose sum is σ = 36770275226880. Its totient is φ = 7831963560960.

The previous prime is 20001221001991. The next prime is 20001221002013. The reversal of 20001221002010 is 1020012210002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20001221001982 and 20001221002000.

It is not an unprimeable number, because it can be changed into a prime (20001221002013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43885100 + ... + 44338520.

It is an arithmetic number, because the mean of its divisors is an integer number (574535550420).

Almost surely, 2^{20001221002010} is an apocalyptic number.

20001221002010 is a deficient number, since it is larger than the sum of its proper divisors (16769054224870).

20001221002010 is a wasteful number, since it uses less digits than its factorization.

20001221002010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454023.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001221002010 its reverse (1020012210002), we get a palindrome (21021233212012).

The spelling of 20001221002010 in words is "twenty trillion, one billion, two hundred twenty-one million, two thousand, ten".