121772181804 has 96 divisors (see below), whose sum is σ = 349846565376. Its totient is φ = 32102714880.

The previous prime is 121772181793. The next prime is 121772181829. The reversal of 121772181804 is 408181277121.

It is a super-3 number, since 3×121772181804³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2836459 + ... + 2879069.

It is an arithmetic number, because the mean of its divisors is an integer number (3644235056).

Almost surely, 2^121772181804 is an apocalyptic number.

121772181804 is a gapful number since it is divisible by the number (14) 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 121772181804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174923282688).

121772181804 is an abundant number, since it is smaller than the sum of its proper divisors (228074383572).

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

121772181804 is a wasteful number, since it uses less digits than its factorization.

121772181804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45255 (or 45253 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 42.

The spelling of 121772181804 in words is "one hundred twenty-one billion, seven hundred seventy-two million, one hundred eighty-one thousand, eight hundred four".