20010211221 has 32 divisors (see below), whose sum is σ = 35822481408. Its totient is φ = 9595304640.

The previous prime is 20010211219. The next prime is 20010211237. The reversal of 20010211221 is 12211201002.

It is not a de Polignac number, because 20010211221 - 2¹ = 20010211219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010211197 and 20010211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010211271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3328701 + ... + 3334706.

It is an arithmetic number, because the mean of its divisors is an integer number (1119452544).

Almost surely, 2^20010211221 is an apocalyptic number.

20010211221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20010211221 is a deficient number, since it is larger than the sum of its proper divisors (15812270187).

20010211221 is a wasteful number, since it uses less digits than its factorization.

20010211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6663441.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20010211221 its reverse (12211201002), we get a palindrome (32221412223).

The spelling of 20010211221 in words is "twenty billion, ten million, two hundred eleven thousand, two hundred twenty-one".