21122044221 has 16 divisors (see below), whose sum is σ = 28211302400. Its totient is φ = 14057100288.

The previous prime is 21122044189. The next prime is 21122044283. The reversal of 21122044221 is 12244022112.

It is not a de Polignac number, because 21122044221 - 2⁵ = 21122044189 is a prime.

It is a super-2 number, since 2×21122044221² (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 (21122040221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5711445 + ... + 5715141.

It is an arithmetic number, because the mean of its divisors is an integer number (1763206400).

Almost surely, 2^21122044221 is an apocalyptic number.

It is an amenable number.

21122044221 is a deficient number, since it is larger than the sum of its proper divisors (7089258179).

21122044221 is a wasteful number, since it uses less digits than its factorization.

21122044221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21122044221 its reverse (12244022112), we get a palindrome (33366066333).

The spelling of 21122044221 in words is "twenty-one billion, one hundred twenty-two million, forty-four thousand, two hundred twenty-one".