21220231121211 has 8 divisors (see below), whose sum is σ = 29957973347664. Its totient is φ = 13314654821120.

The previous prime is 21220231121209. The next prime is 21220231121263. The reversal of 21220231121211 is 11212113202212.

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

It is a cyclic number.

It is not a de Polignac number, because 21220231121211 - 2¹ = 21220231121209 is a prime.

It is a super-2 number, since 2×21220231121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220231129211) 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, 208041481530 + ... + 208041481631.

It is an arithmetic number, because the mean of its divisors is an integer number (3744746668458).

Almost surely, 2^{21220231121211} is an apocalyptic number.

21220231121211 is a deficient number, since it is larger than the sum of its proper divisors (8737742226453).

21220231121211 is a wasteful number, since it uses less digits than its factorization.

21220231121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416082963181.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21220231121211 its reverse (11212113202212), we get a palindrome (32432344323423).

The spelling of 21220231121211 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred eleven".