11219172381 has 20 divisors (see below), whose sum is σ = 16770309600. Its totient is φ = 7474626216.

The previous prime is 11219172373. The next prime is 11219172401. The reversal of 11219172381 is 18327191211.

11219172381 is a `hidden beast` number, since 1 + 121 + 91 + 72 + 381 = 666.

It is not a de Polignac number, because 11219172381 - 2³ = 11219172373 is a prime.

It is a super-2 number, since 2×11219172381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11219172331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 84040 + ... + 171758.

It is an arithmetic number, because the mean of its divisors is an integer number (838515480).

Almost surely, 2^11219172381 is an apocalyptic number.

It is an amenable number.

11219172381 is a deficient number, since it is larger than the sum of its proper divisors (5551137219).

11219172381 is an equidigital number, since it uses as much as digits as its factorization.

11219172381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89310 (or 89301 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The spelling of 11219172381 in words is "eleven billion, two hundred nineteen million, one hundred seventy-two thousand, three hundred eighty-one".