2011721022257 has 16 divisors (see below), whose sum is σ = 2248275421440. Its totient is φ = 1788845015808.

The previous prime is 2011721022229. The next prime is 2011721022263. The reversal of 2011721022257 is 7522201271102.

It is a cyclic number.

It is not a de Polignac number, because 2011721022257 - 2¹⁸ = 2011720760113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011721025257) 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, 8366798 + ... + 8603879.

It is an arithmetic number, because the mean of its divisors is an integer number (140517213840).

Almost surely, 2^{2011721022257} is an apocalyptic number.

It is an amenable number.

2011721022257 is a deficient number, since it is larger than the sum of its proper divisors (236554399183).

2011721022257 is a wasteful number, since it uses less digits than its factorization.

2011721022257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16971080.

The product of its (nonzero) digits is 7840, while the sum is 32.

Adding to 2011721022257 its reverse (7522201271102), we get a palindrome (9533922293359).

The spelling of 2011721022257 in words is "two trillion, eleven billion, seven hundred twenty-one million, twenty-two thousand, two hundred fifty-seven".