20010011221221 has 16 divisors (see below), whose sum is σ = 30495486119424. Its totient is φ = 11432776958064.

The previous prime is 20010011221177. The next prime is 20010011221229. The reversal of 20010011221221 is 12212211001002.

It is not a de Polignac number, because 20010011221221 - 2¹⁴ = 20010011204837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20010011221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010011221229) 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, 62969755 + ... + 63286728.

It is an arithmetic number, because the mean of its divisors is an integer number (1905967882464).

Almost surely, 2^{20010011221221} is an apocalyptic number.

20010011221221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20010011221221 is a deficient number, since it is larger than the sum of its proper divisors (10485474898203).

20010011221221 is a wasteful number, since it uses less digits than its factorization.

20010011221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126264040.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20010011221221 its reverse (12212211001002), we get a palindrome (32222222222223).

The spelling of 20010011221221 in words is "twenty trillion, ten billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".