181012012021 has 8 divisors (see below), whose sum is σ = 191700203904. Its totient is φ = 170328312000.

The previous prime is 181012012009. The next prime is 181012012031. The reversal of 181012012021 is 120210210181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181012012021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181012012021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181012012031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039815 + ... + 1201348.

It is an arithmetic number, because the mean of its divisors is an integer number (23962525488).

Almost surely, 2^181012012021 is an apocalyptic number.

It is an amenable number.

181012012021 is a deficient number, since it is larger than the sum of its proper divisors (10688191883).

181012012021 is a wasteful number, since it uses less digits than its factorization.

181012012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245931.

The product of its (nonzero) digits is 64, while the sum is 19.

The spelling of 181012012021 in words is "one hundred eighty-one billion, twelve million, twelve thousand, twenty-one".