12211120220021 has 8 divisors (see below), whose sum is σ = 12952634025240. Its totient is φ = 11472185594368.

The previous prime is 12211120220009. The next prime is 12211120220023. The reversal of 12211120220021 is 12002202111221.

It can be written as a sum of positive squares in 4 ways, for example, as 591468664900 + 11619651555121 = 769070^2 + 3408761^2 .

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-12211120220021 is a prime.

It is a super-2 number, since 2×12211120220021² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211120220023) 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, 644785136 + ... + 644804073.

It is an arithmetic number, because the mean of its divisors is an integer number (1619079253155).

Almost surely, 2^{12211120220021} is an apocalyptic number.

It is an amenable number.

12211120220021 is a deficient number, since it is larger than the sum of its proper divisors (741513805219).

12211120220021 is a wasteful number, since it uses less digits than its factorization.

12211120220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289589783.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12211120220021 its reverse (12002202111221), we get a palindrome (24213322331242).

The spelling of 12211120220021 in words is "twelve trillion, two hundred eleven billion, one hundred twenty million, two hundred twenty thousand, twenty-one".