20213011221 has 8 divisors (see below), whose sum is σ = 29023811040. Its totient is φ = 12438776112.

The previous prime is 20213011211. The next prime is 20213011241. The reversal of 20213011221 is 12211031202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20213011221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20213011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213011201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259141131 + ... + 259141208.

It is an arithmetic number, because the mean of its divisors is an integer number (3627976380).

Almost surely, 2^20213011221 is an apocalyptic number.

It is an amenable number.

20213011221 is a deficient number, since it is larger than the sum of its proper divisors (8810799819).

20213011221 is a wasteful number, since it uses less digits than its factorization.

20213011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518282355.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20213011221 its reverse (12211031202), we get a palindrome (32424042423).

The spelling of 20213011221 in words is "twenty billion, two hundred thirteen million, eleven thousand, two hundred twenty-one".