2121012154 has 8 divisors (see below), whose sum is σ = 3184093908. Its totient is φ = 1059647520.

The previous prime is 2121012139. The next prime is 2121012163. The reversal of 2121012154 is 4512101212.

It can be written as a sum of positive squares in 2 ways, for example, as 2103598225 + 17413929 = 45865^2 + 4173^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426187 + ... + 431134.

Almost surely, 2^2121012154 is an apocalyptic number.

2121012154 is a deficient number, since it is larger than the sum of its proper divisors (1063081754).

2121012154 is a wasteful number, since it uses less digits than its factorization.

2121012154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858560.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2121012154 is about 46054.4477113775. The cubic root of 2121012154 is about 1284.8360662345.

Adding to 2121012154 its reverse (4512101212), we get a palindrome (6633113366).

The spelling of 2121012154 in words is "two billion, one hundred twenty-one million, twelve thousand, one hundred fifty-four".