2056111021221 has 16 divisors (see below), whose sum is σ = 2744276538240. Its totient is φ = 1369343684160.

The previous prime is 2056111021201. The next prime is 2056111021231. The reversal of 2056111021221 is 1221201116502.

It is a happy number.

It is not a de Polignac number, because 2056111021221 - 2¹³ = 2056111013029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2056111021191 and 2056111021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056111021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14300536 + ... + 14443598.

It is an arithmetic number, because the mean of its divisors is an integer number (171517283640).

Almost surely, 2^{2056111021221} is an apocalyptic number.

It is an amenable number.

2056111021221 is a deficient number, since it is larger than the sum of its proper divisors (688165517019).

2056111021221 is a wasteful number, since it uses less digits than its factorization.

2056111021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147916.

The product of its (nonzero) digits is 480, while the sum is 24.

Adding to 2056111021221 its reverse (1221201116502), we get a palindrome (3277312137723).

The spelling of 2056111021221 in words is "two trillion, fifty-six billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".