181249221402 has 32 divisors (see below), whose sum is σ = 426468758400. Its totient is φ = 56862500544.

The previous prime is 181249221401. The next prime is 181249221407. The reversal of 181249221402 is 204122942181.

181249221402 is a `hidden beast` number, since 1 + 8 + 1 + 24 + 9 + 221 + 402 = 666.

It is not an unprimeable number, because it can be changed into a prime (181249221401) 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, 98718702 + ... + 98720537.

It is an arithmetic number, because the mean of its divisors is an integer number (13327148700).

Almost surely, 2^181249221402 is an apocalyptic number.

181249221402 is an abundant number, since it is smaller than the sum of its proper divisors (245219536998).

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

181249221402 is a wasteful number, since it uses less digits than its factorization.

181249221402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197439267 (or 197439261 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 181249221402 in words is "one hundred eighty-one billion, two hundred forty-nine million, two hundred twenty-one thousand, four hundred two".