11220949976781 has 16 divisors (see below), whose sum is σ = 15041206125504. Its totient is φ = 7440765930624.

The previous prime is 11220949976777. The next prime is 11220949976843. The reversal of 11220949976781 is 18767994902211.

11220949976781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11220949976781 - 2² = 11220949976777 is a prime.

It is a super-2 number, since 2×11220949976781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220949976081) 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, 12355806 + ... + 13232831.

It is an arithmetic number, because the mean of its divisors is an integer number (940075382844).

Almost surely, 2^{11220949976781} is an apocalyptic number.

It is an amenable number.

11220949976781 is a deficient number, since it is larger than the sum of its proper divisors (3820256148723).

11220949976781 is a wasteful number, since it uses less digits than its factorization.

11220949976781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25589420.

The product of its (nonzero) digits is 27433728, while the sum is 66.

The spelling of 11220949976781 in words is "eleven trillion, two hundred twenty billion, nine hundred forty-nine million, nine hundred seventy-six thousand, seven hundred eighty-one".