21021022212211 has 8 divisors (see below), whose sum is σ = 24024211751520. Its totient is φ = 18017879264448.

The previous prime is 21021022212209. The next prime is 21021022212217. The reversal of 21021022212211 is 11221222012012.

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

It is not a de Polignac number, because 21021022212211 - 2¹ = 21021022212209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021022212217) 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, 10675666 + ... + 12490471.

It is an arithmetic number, because the mean of its divisors is an integer number (3003026468940).

Almost surely, 2^{21021022212211} is an apocalyptic number.

21021022212211 is a deficient number, since it is larger than the sum of its proper divisors (3003189539309).

21021022212211 is a wasteful number, since it uses less digits than its factorization.

21021022212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23295773.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021022212211 its reverse (11221222012012), we get a palindrome (32242244224223).

The spelling of 21021022212211 in words is "twenty-one trillion, twenty-one billion, twenty-two million, two hundred twelve thousand, two hundred eleven".