20010111001221 has 16 divisors (see below), whose sum is σ = 30817711061568. Its totient is φ = 11413967059200.

The previous prime is 20010111001211. The next prime is 20010111001229. The reversal of 20010111001221 is 12210011101002.

It is not a de Polignac number, because 20010111001221 - 2⁷ = 20010111001093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010111001197 and 20010111001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010111001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17834322970 + ... + 17834324091.

It is an arithmetic number, because the mean of its divisors is an integer number (1926106941348).

Almost surely, 2^{20010111001221} is an apocalyptic number.

It is an amenable number.

20010111001221 is a deficient number, since it is larger than the sum of its proper divisors (10807600060347).

20010111001221 is a wasteful number, since it uses less digits than its factorization.

20010111001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35668647092.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20010111001221 its reverse (12210011101002), we get a palindrome (32220122102223).

The spelling of 20010111001221 in words is "twenty trillion, ten billion, one hundred eleven million, one thousand, two hundred twenty-one".