12217151772 has 216 divisors, whose sum is σ = 38192918400. Its totient is φ = 3273867072.

The previous prime is 12217151761. The next prime is 12217151773. The reversal of 12217151772 is 27715171221.

12217151772 = T₄₆₃ + T₄₆₄ + ... + T₄₁₈₆.

It is a happy number.

12217151772 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 71 + 517 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12217151773) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3450379 + ... + 3453917.

Almost surely, 2^12217151772 is an apocalyptic number.

12217151772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12217151772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19096459200).

12217151772 is an abundant number, since it is smaller than the sum of its proper divisors (25975766628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12217151772 is a wasteful number, since it uses less digits than its factorization.

12217151772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685 (or 3673 counting only the distinct ones).

The product of its digits is 13720, while the sum is 36.

The spelling of 12217151772 in words is "twelve billion, two hundred seventeen million, one hundred fifty-one thousand, seven hundred seventy-two".