120000001821 has 24 divisors (see below), whose sum is σ = 186199257024. Its totient is φ = 68543133120.

The previous prime is 120000001819. The next prime is 120000001853. The reversal of 120000001821 is 128100000021.

It is not a de Polignac number, because 120000001821 - 2¹ = 120000001819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120000001821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120000001021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191616 + ... + 526038.

It is an arithmetic number, because the mean of its divisors is an integer number (7758302376).

Almost surely, 2^120000001821 is an apocalyptic number.

It is an amenable number.

120000001821 is a deficient number, since it is larger than the sum of its proper divisors (66199255203).

120000001821 is a wasteful number, since it uses less digits than its factorization.

120000001821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336881 (or 336874 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 120000001821 its reverse (128100000021), we get a palindrome (248100001842).

The spelling of 120000001821 in words is "one hundred twenty billion, one thousand, eight hundred twenty-one".