21122211222211 has 8 divisors (see below), whose sum is σ = 23060178188784. Its totient is φ = 19187205246720.

The previous prime is 21122211222191. The next prime is 21122211222269. The reversal of 21122211222211 is 11222211222112.

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 21122211222211 - 2¹³ = 21122211214019 is a prime.

It is a super-2 number, since 2×21122211222211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122211222271) 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, 740232850 + ... + 740261383.

It is an arithmetic number, because the mean of its divisors is an integer number (2882522273598).

Almost surely, 2^{21122211222211} is an apocalyptic number.

21122211222211 is a deficient number, since it is larger than the sum of its proper divisors (1937966966573).

21122211222211 is a wasteful number, since it uses less digits than its factorization.

21122211222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480495541.

The product of its digits is 256, while the sum is 22.

Adding to 21122211222211 its reverse (11222211222112), we get a palindrome (32344422444323).

Subtracting from 21122211222211 its reverse (11222211222112), we obtain a palindrome (9900000000099).

The spelling of 21122211222211 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred eleven million, two hundred twenty-two thousand, two hundred eleven".