21011222212211 has 8 divisors (see below), whose sum is σ = 26195809511424. Its totient is φ = 16372380944520.

The previous prime is 21011222212193. The next prime is 21011222212219. The reversal of 21011222212211 is 11221222211012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011222212211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011222212219) 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, 136436507795 + ... + 136436507948.

It is an arithmetic number, because the mean of its divisors is an integer number (3274476188928).

Almost surely, 2^{21011222212211} is an apocalyptic number.

21011222212211 is a deficient number, since it is larger than the sum of its proper divisors (5184587299213).

21011222212211 is a wasteful number, since it uses less digits than its factorization.

21011222212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272873015761.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21011222212211 its reverse (11221222211012), we get a palindrome (32232444423223).

The spelling of 21011222212211 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred eleven".