20011221213 has 8 divisors (see below), whose sum is σ = 26930989728. Its totient is φ = 13216133424.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221213 is 31212211002.

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

It is not a de Polignac number, because 20011221213 - 2⁶ = 20011221149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011221192 and 20011221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221253) 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, 31169806 + ... + 31170447.

It is an arithmetic number, because the mean of its divisors is an integer number (3366373716).

Almost surely, 2^20011221213 is an apocalyptic number.

It is an amenable number.

20011221213 is a deficient number, since it is larger than the sum of its proper divisors (6919768515).

20011221213 is a wasteful number, since it uses less digits than its factorization.

20011221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62340363.

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

Adding to 20011221213 its reverse (31212211002), we get a palindrome (51223432215).

The spelling of 20011221213 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred thirteen".