21122011223 has 8 divisors (see below), whose sum is σ = 21291950592. Its totient is φ = 20952128736.

The previous prime is 21122011217. The next prime is 21122011243. The reversal of 21122011223 is 32211022112.

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 21122011223 - 2⁶ = 21122011159 is a prime.

It is a super-2 number, since 2×21122011223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122011213) 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, 1046261 + ... + 1066257.

It is an arithmetic number, because the mean of its divisors is an integer number (2661493824).

Almost surely, 2^21122011223 is an apocalyptic number.

21122011223 is a deficient number, since it is larger than the sum of its proper divisors (169939369).

21122011223 is a wasteful number, since it uses less digits than its factorization.

21122011223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28441.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21122011223 its reverse (32211022112), we get a palindrome (53333033335).

The spelling of 21122011223 in words is "twenty-one billion, one hundred twenty-two million, eleven thousand, two hundred twenty-three".