21122000011221 has 16 divisors (see below), whose sum is σ = 28956016981248. Its totient is φ = 13687192857600.

The previous prime is 21122000011219. The next prime is 21122000011243. The reversal of 21122000011221 is 12211000022112.

It is not a de Polignac number, because 21122000011221 - 2¹ = 21122000011219 is a prime.

It is a super-2 number, since 2×21122000011221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122000011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122000011421) 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, 316799836 + ... + 316866501.

It is an arithmetic number, because the mean of its divisors is an integer number (1809751061328).

Almost surely, 2^{21122000011221} is an apocalyptic number.

It is an amenable number.

21122000011221 is a deficient number, since it is larger than the sum of its proper divisors (7834016970027).

21122000011221 is a wasteful number, since it uses less digits than its factorization.

21122000011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633666652.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122000011221 its reverse (12211000022112), we get a palindrome (33333000033333).

The spelling of 21122000011221 in words is "twenty-one trillion, one hundred twenty-two billion, eleven thousand, two hundred twenty-one".